diff --git a/.github/workflows/nightly-build.yml b/.github/workflows/nightly-build.yml
index 24b6974a5..3fa440bd1 100644
--- a/.github/workflows/nightly-build.yml
+++ b/.github/workflows/nightly-build.yml
@@ -95,6 +95,14 @@ jobs:
         run: |
           python3 tools/ci/nightly.py pick ${FORCE:+--force} | tee -a "$GITHUB_STEP_SUMMARY"
           { echo; cat nightly-notes.md; } >> "$GITHUB_STEP_SUMMARY"
+      - name: Old nightly/build-* branches deleted (scheduled runs only)
+        # Ludovic, 2026-10-27: older than 7 days, but never the newest build or one a published nightly points to;
+        # nothing but nightly/build-* (nightly.py stale_builds, tests/test_nightly.py).
+        if: github.event_name == 'schedule'
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          { echo "### nightly/build-* branches"; python3 tools/ci/nightly.py prune-builds --days 7; } | tee -a "$GITHUB_STEP_SUMMARY"
       - uses: actions/upload-artifact@v4
         with:
           name: nightly-notes
diff --git a/AGENTS.md b/AGENTS.md
index 3804ebae8..e5561f7b5 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -35,7 +35,8 @@ Game workspace (root `Cargo.toml`); `launcher/` and `crates/horizon-telemetry-se
 
 | Crate | Owns |
 |---|---|
-| `horizon-client` | The game: a lib (`src/lib.rs`, ~180 flat modules) and the bin (`src/main.rs` → `game.rs` + `game/`), plus `horizon-ctl` (`src/bin/horizon-ctl/`). Also the dedicated server (`--dedicated`) |
+| `horizon-client` | The game: a lib (`src/lib.rs`, ~170 flat modules) and the bin (`src/main.rs` → `game.rs` + `game/`), plus `horizon-ctl` (`src/bin/horizon-ctl/`). Also the dedicated server (`--dedicated`) |
+| `horizon-items` | Blocks and items below gameplay: `blocks.rs` (block facts), `items.rs`, `item_data.rs` (components), `enchant.rs`, `cooldowns.rs`, `bundle.rs`, `item_nbt.rs`. Re-exported as `horizon_client::items`... |
 | `horizon-command` | Command parsing (Brigadier): the vanilla tree, argument types, selectors, suggestions, the tree's network form. Re-exported as `horizon_client::command` |
 | `horizon-client-core` | The client lib's bottom layer: `text.rs`, `lang.rs`, `snbt.rs`, `nbt_path.rs`, `component.rs`, `scoreboard.rs`, `bossbar.rs`, `gamerules.rs`, `block_entity_nbt.rs`, registry/particle/sound tables. Re-exported under the old paths (`horizon_client::text`...) |
 | `horizon-world` | Vanilla world data with no gameplay loop: NBT, regions, chunks, `datafix/`, `worldgen/`, `level/` (server-side block behaviour, ticks, redstone), entity physics, items, effects, food, damage |
@@ -120,7 +121,7 @@ python3 tools/agent_control_e2e.py         # horizon-ctl / MCP end to end
 | Block behaviour | `crates/horizon-world/src/level/` (`mod.rs`, `tick.rs`, `hooks.rs`, `redstone.rs`, `place.rs`, `interact.rs`); game.rs `fn tick_blocks`, `fn process_level_events` |
 | Mobs | L: `mobs.rs` (types), `mobs/` (`ai.rs`, `goals.rs`, `brain.rs`, `*_brain.rs`, `nav.rs`, `path.rs`, `species.rs`, `spawning.rs`, `render.rs`, `anim.rs`); G: `creatures.rs` (ticking, spawning, mob events), one file per mob family (`dragon.rs`, `wither.rs`, `villagers.rs`, `piglins.rs`, `golems.rs`...), `natural_spawning.rs` |
 | Other entities | L: `entities.rs`, `projectiles.rs`, `arrows.rs`; G: `boats.rs`, `minecarts.rs`, `mounts.rs`, `armor_stands.rs`, `paintings.rs`, `frames.rs`, `fireworks.rs`, `tnt.rs`, `explosion.rs` |
-| Player actions | game.rs (`fn use_hand`, `fn use_item`, `fn attack`, `fn tick_mining`, `fn break_block`); G: `hand.rs`, `combat.rs`, `consume.rs`, `potions.rs`, `shield.rs`, `crossbow.rs`, `trident.rs`, `fishing.rs`; L: `motion.rs` + `motion/` (movement), `collisions.rs`, `items.rs`, `item_data.rs` |
+| Player actions | game.rs (`fn use_hand`, `fn use_item`, `fn attack`, `fn tick_mining`, `fn break_block`); G: `hand.rs`, `combat.rs`, `consume.rs`, `potions.rs`, `shield.rs`, `crossbow.rs`, `trident.rs`, `fishing.rs`; L: `motion.rs` + `motion/` (movement), `collisions.rs`; crate `horizon-items`: `items.rs`, `item_data.rs`, `enchant.rs`, `blocks.rs` |
 | Inventory and containers | L: `menu.rs` (`AbstractContainerMenu.clicked`), `container_screen.rs`, `containers.rs`, `creative.rs`, `crafting.rs`, `recipe_book*.rs`, `stations.rs`, `merchant.rs`; game.rs `fn menu_ops`, `fn click_inventory`; G: `stations.rs`, `trading.rs`, `recipe_book.rs`, `machines.rs` |
 | Commands | parse: crate `horizon-command` (`args.rs`, `selector.rs`, `tree_*.rs`, `vanilla.rs`); run: G: `commands.rs` (dispatch) + `commands/*.rs` (`admin`, `execute`, `items`, `players`, `world_cmds`...); L: `scoreboard_cmd.rs`, `data_cmd.rs`; `horizon-client-core`: `nbt_path.rs`, `scoreboard.rs`; G: `functions.rs`, `command_blocks.rs` |
 | UI screens | `Screen` enum in game.rs; L: `title.rs` + `title/`, `options_ui.rs`, `multiplayer.rs`, `pack_screen.rs`, `graphics_ui.rs`, `screen_draw.rs`, `ui.rs` (widgets), `hud.rs`, `hud_layout.rs`, `hud_overlays.rs`, `chat.rs`, `tab_list.rs`; G: `startup_menu.rs`, `screens.rs` (pause, death), `options.rs`, `lan_screen.rs`, `chat.rs`, `sign_edit.rs`, `books.rs` |
diff --git a/Cargo.lock b/Cargo.lock
index e65b25dab..026eef014 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1385,6 +1385,7 @@ dependencies = [
  "horizon-dualsense",
  "horizon-friends",
  "horizon-hdr",
+ "horizon-items",
  "horizon-mods",
  "horizon-protocol",
  "horizon-server-files",
@@ -1469,6 +1470,17 @@ dependencies = [
  "wgpu",
 ]
 
+[[package]]
+name = "horizon-items"
+version = "0.1.0"
+dependencies = [
+ "horizon-client-core",
+ "horizon-core",
+ "horizon-world",
+ "serde",
+ "serde_json",
+]
+
 [[package]]
 name = "horizon-mod-sdk"
 version = "0.1.0"
diff --git a/Cargo.toml b/Cargo.toml
index 8f3153c62..908badb65 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,6 +9,7 @@ members = [
     "crates/horizon-client",
     "crates/horizon-client-core",
     "crates/horizon-command",
+    "crates/horizon-items",
     "crates/horizon-server-files",
     "crates/horizon-server",
     "crates/horizon-bots",
diff --git a/crates/horizon-client-core/src/component.rs b/crates/horizon-client-core/src/component.rs
index 7437e4ea8..248c78617 100644
--- a/crates/horizon-client-core/src/component.rs
+++ b/crates/horizon-client-core/src/component.rs
@@ -1,6 +1,7 @@
 //! Text components from commands: `ComponentArgument` reads an SNBT (or JSON)
 //! value, `ComponentSerialization` turns it into styled text.
 use crate::text::{Style, Text, named_color};
+use horizon_world::nbt::Tag;
 use serde_json::{Map, Value};
 
 /// `SnbtGrammar`, enough for components: compounds, lists, quoted and
@@ -299,6 +300,15 @@ pub fn to_text_with(
     }
 }
 
+/// `CustomName` as text: a string keeps its legacy formatting codes, anything
+/// else is a component (`ComponentSerialization`).
+pub fn name_text(tag: &Tag) -> Text {
+    match tag {
+        Tag::String(s) => Text::legacy(&s.to_string_lossy()),
+        t => crate::scoreboard::comp_text(&crate::scoreboard::tag_to_json(t)),
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/crates/horizon-client-core/src/lib.rs b/crates/horizon-client-core/src/lib.rs
index 7721668ca..d839feddf 100644
--- a/crates/horizon-client-core/src/lib.rs
+++ b/crates/horizon-client-core/src/lib.rs
@@ -14,6 +14,7 @@ pub mod identifier;
 pub mod key_display;
 pub mod lang;
 pub mod nbt_path;
+pub mod nbt_value;
 pub mod particle_type;
 pub mod pattern;
 pub mod potions;
diff --git a/crates/horizon-client-core/src/nbt_value.rs b/crates/horizon-client-core/src/nbt_value.rs
new file mode 100644
index 000000000..7f7d728b0
--- /dev/null
+++ b/crates/horizon-client-core/src/nbt_value.rs
@@ -0,0 +1,24 @@
+//! Reading and writing single NBT values the way vanilla's codecs accept them.
+use horizon_world::nbt::Tag;
+
+pub fn string(s: &str) -> Tag {
+    Tag::String(s.into())
+}
+pub fn text(tag: Option<&Tag>) -> Option<String> {
+    match tag {
+        Some(Tag::String(s)) => Some(s.to_string_lossy()),
+        _ => None,
+    }
+}
+/// Any numeric tag as i64 (vanilla's `getIntOr` etc. accept every number type).
+pub fn number(tag: Option<&Tag>) -> Option<i64> {
+    Some(match tag? {
+        Tag::Byte(v) => i64::from(*v),
+        Tag::Short(v) => i64::from(*v),
+        Tag::Int(v) => i64::from(*v),
+        Tag::Long(v) => *v,
+        Tag::Float(b) => f32::from_bits(*b) as i64,
+        Tag::Double(b) => f64::from_bits(*b) as i64,
+        _ => return None,
+    })
+}
diff --git a/crates/horizon-client/Cargo.toml b/crates/horizon-client/Cargo.toml
index 150433918..12b1ccfb5 100644
--- a/crates/horizon-client/Cargo.toml
+++ b/crates/horizon-client/Cargo.toml
@@ -11,6 +11,7 @@ description = "Horizon native development client"
 horizon-assets = { path = "../horizon-assets" }
 horizon-client-core = { path = "../horizon-client-core" }
 horizon-command = { path = "../horizon-command" }
+horizon-items = { path = "../horizon-items" }
 horizon-core = { path = "../horizon-core" }
 # The server thread ahead of the workers (MinecraftServer.spin's Thread.setPriority).
 horizon-threads = { path = "../horizon-threads" }
@@ -105,5 +106,6 @@ path = "examples/probe/main.rs"
 workspace = true
 
 [dev-dependencies]
+horizon-items = { path = "../horizon-items", features = ["test-support"] }
 # Every WGSL shader translated as wgpu's DirectX 12 backend does (gfx.rs tests).
 naga = { version = "30.0.1", features = ["wgsl-in", "hlsl-out", "msl-out", "spv-out"] }
diff --git a/crates/horizon-client/examples/gameplay_decode_profile.rs b/crates/horizon-client/examples/gameplay_decode_profile.rs
index 60260452f..2731b9e88 100644
--- a/crates/horizon-client/examples/gameplay_decode_profile.rs
+++ b/crates/horizon-client/examples/gameplay_decode_profile.rs
@@ -2,7 +2,7 @@
 //! Build with `cargo build --release -p horizon-client --example gameplay_decode_profile`.
 //! Each invocation runs one phase in a separate process for CPU/RSS measurements.
 #[allow(dead_code)]
-#[path = "../src/blocks/decode.rs"]
+#[path = "../../horizon-items/src/blocks/decode.rs"]
 mod decode;
 
 use std::{hint::black_box, path::Path, time::Instant};
diff --git a/crates/horizon-client/examples/probe/mob_ai_probe.rs b/crates/horizon-client/examples/probe/mob_ai_probe.rs
index 0e0813f4a..3aae26211 100644
--- a/crates/horizon-client/examples/probe/mob_ai_probe.rs
+++ b/crates/horizon-client/examples/probe/mob_ai_probe.rs
@@ -1077,6 +1077,8 @@ pub fn main() -> horizon_client::Result<()> {
                 uuid: PLAYER_UUID,
                 allies: Default::default(),
                 remote: false,
+                sleeping: false,
+                sleep_timer: 0,
                 passenger: false,
             }
         });
diff --git a/crates/horizon-client/src/assets.rs b/crates/horizon-client/src/assets.rs
index beafa96fd..99d169c93 100644
--- a/crates/horizon-client/src/assets.rs
+++ b/crates/horizon-client/src/assets.rs
@@ -234,3 +234,81 @@ impl RenderAssets {
         })
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::items::ConsumeEffect;
+
+    #[test]
+    fn always_edible_and_consume_effects_loaded() {
+        let root = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+            .join("../../.local/horizon-client/26.3");
+        if !root.join("items.json").exists() {
+            return;
+        }
+        let assets = crate::assets::Assets::load(&root).unwrap();
+        let facts = crate::blocks::BlockFacts::load(&root, assets.registry).unwrap();
+        let items = crate::items::Items::load(&root, assets.registry, &facts).unwrap();
+
+        let apple = items.get("minecraft:golden_apple").expect("golden apple");
+        assert!(apple.can_always_eat);
+        assert!(apple.food.is_some());
+        assert!(!apple.consumable.as_ref().unwrap().effects.is_empty());
+
+        let enchanted = items
+            .get("minecraft:enchanted_golden_apple")
+            .expect("enchanted golden apple");
+        assert!(enchanted.can_always_eat);
+        assert!(enchanted.food.is_some());
+        assert!(!enchanted.consumable.as_ref().unwrap().effects.is_empty());
+
+        let beef = items.get("minecraft:cooked_beef").expect("cooked beef");
+        assert!(!beef.can_always_eat);
+        assert!(beef.food.is_some());
+
+        // Consumables without food, their style and their remainders.
+        use horizon_world::consumable::UseAnimation;
+        let milk = items.get("minecraft:milk_bucket").expect("milk bucket");
+        let drink = milk.consumable.as_ref().unwrap();
+        assert!(milk.food.is_none());
+        assert_eq!(drink.effects, [ConsumeEffect::ClearAllEffects]);
+        assert_eq!((drink.ticks(), drink.animation), (32, UseAnimation::Drink));
+        assert_eq!(drink.sound, "minecraft:entity.generic.drink");
+        assert!(!drink.particles);
+        assert_eq!(milk.use_remainder.as_deref(), Some("minecraft:bucket"));
+        let honey = items.get("minecraft:honey_bottle").expect("honey bottle");
+        let sip = honey.consumable.as_ref().unwrap();
+        assert_eq!(sip.ticks(), 40);
+        assert_eq!(sip.sound, "minecraft:item.honey_bottle.drink");
+        assert_eq!(
+            sip.effects,
+            [ConsumeEffect::RemoveEffects(vec![
+                "minecraft:poison".into()
+            ])]
+        );
+        assert_eq!(
+            honey.use_remainder.as_deref(),
+            Some("minecraft:glass_bottle")
+        );
+        let kelp = items.get("minecraft:dried_kelp").unwrap();
+        let bite = kelp.consumable.as_ref().unwrap();
+        assert_eq!((bite.ticks(), bite.animation), (16, UseAnimation::Eat));
+        assert_eq!(bite.sound, "minecraft:entity.generic.eat");
+        assert!(bite.particles && kelp.use_remainder.is_none());
+        let chorus = items.get("minecraft:chorus_fruit").unwrap();
+        assert_eq!(
+            chorus.consumable.as_ref().unwrap().effects,
+            [ConsumeEffect::TeleportRandomly(
+                horizon_world::teleport_consume::TeleportConsume {
+                    diameter: 16.0,
+                    directional_particles: true,
+                }
+            )]
+        );
+        let chicken = items.get("minecraft:chicken").unwrap();
+        assert!(matches!(
+            chicken.consumable.as_ref().unwrap().effects[..],
+            [ConsumeEffect::ApplyEffects { probability, .. }] if probability == 0.3
+        ));
+    }
+}
diff --git a/crates/horizon-client/src/banner.rs b/crates/horizon-client/src/banner.rs
index aa470a552..a8ffe735b 100644
--- a/crates/horizon-client/src/banner.rs
+++ b/crates/horizon-client/src/banner.rs
@@ -3,24 +3,10 @@
 //! banners, and the loom rules of `LoomMenu` (selectable patterns, the
 //! six-layer limit and the result stack).
 use crate::{block_entity_render::DYES, items::ItemStack, items::Items};
-use horizon_world::nbt::Tag;
 use serde_json::Value;
 use std::{collections::HashMap, fs, path::Path, sync::Arc};
 
-/// `BannerPatternLayers.Layer`: a pattern id and the dye name it is painted in.
-#[derive(Clone, Debug, PartialEq, Eq)]
-pub struct BannerLayer {
-    pub pattern: Arc<str>,
-    pub color: Arc<str>,
-}
-impl BannerLayer {
-    pub fn new(pattern: &str, color: &str) -> Self {
-        Self {
-            pattern: Arc::from(pattern),
-            color: Arc::from(color),
-        }
-    }
-}
+pub use horizon_items::banner_layer::{BannerLayer, layers_from_nbt, layers_to_nbt};
 
 /// Layers a loom may stack on a banner (`LoomMenu`'s `hasMaxPatterns`).
 pub const MAX_LAYERS: usize = 6;
@@ -224,44 +210,6 @@ pub fn has_max_layers(banner: &ItemStack) -> bool {
     layers(banner).len() >= MAX_LAYERS
 }
 
-/// The `banner_patterns` NBT list of layers.
-pub fn layers_to_nbt(layers: &[BannerLayer]) -> Tag {
-    Tag::List(
-        layers
-            .iter()
-            .map(|l| {
-                Tag::compound([
-                    ("pattern", Tag::String((&*l.pattern).into())),
-                    ("color", Tag::String((&*l.color).into())),
-                ])
-            })
-            .collect(),
-    )
-}
-pub fn layers_from_nbt(tag: Option<&Tag>) -> Vec<BannerLayer> {
-    let Some(Tag::List(list)) = tag else {
-        return Vec::new();
-    };
-    list.iter()
-        .filter_map(|e| {
-            let text = |k: &str| match e.get(k) {
-                Some(Tag::String(s)) => Some(s.to_string_lossy()),
-                _ => None,
-            };
-            let pattern = text("pattern")?;
-            let color = text("color")?;
-            Some(BannerLayer::new(
-                &if pattern.contains(':') {
-                    pattern
-                } else {
-                    format!("minecraft:{pattern}")
-                },
-                &color,
-            ))
-        })
-        .collect()
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/crates/horizon-client/src/entity_nbt.rs b/crates/horizon-client/src/entity_nbt.rs
index a2d1bef82..0980da371 100644
--- a/crates/horizon-client/src/entity_nbt.rs
+++ b/crates/horizon-client/src/entity_nbt.rs
@@ -13,7 +13,6 @@ use crate::{
         doubles, float, floats, item_from_nbt, item_to_nbt, number, put, read_doubles, text,
         uuid_from_tag,
     },
-    text::Text,
 };
 use horizon_core::geometry::Vec3;
 use horizon_world::nbt::{Compound, Tag};
@@ -874,14 +873,7 @@ fn custom_name(tag: &Tag) -> Option<String> {
         _ => None,
     }
 }
-/// `CustomName` as text: a string keeps its legacy formatting codes, anything
-/// else is a component (`ComponentSerialization`).
-pub fn name_text(tag: &Tag) -> Text {
-    match tag {
-        Tag::String(s) => Text::legacy(&s.to_string_lossy()),
-        t => crate::scoreboard::comp_text(&crate::scoreboard::tag_to_json(t)),
-    }
-}
+pub use horizon_client_core::component::name_text;
 /// Mob.finalizeSpawn's follow range bonus in the saved attributes.
 pub(crate) fn spawn_bonus(tag: &Tag) -> Option<f64> {
     let Some(Tag::List(attrs)) = tag.get("attributes") else {
diff --git a/crates/horizon-client/src/first_person.rs b/crates/horizon-client/src/first_person.rs
index 12c97dfa0..b2f1ab331 100644
--- a/crates/horizon-client/src/first_person.rs
+++ b/crates/horizon-client/src/first_person.rs
@@ -443,18 +443,7 @@ impl UseResult {
         matches!(self, Self::Success { swing: true }) && before == after
     }
 }
-pub fn consumable_animation(v: &serde_json::Value) -> horizon_world::consumable::UseAnimation {
-    use horizon_world::consumable::UseAnimation;
-    match v
-        .get("animation")
-        .and_then(serde_json::Value::as_str)
-        .unwrap_or("eat")
-    {
-        "eat" => UseAnimation::Eat,
-        "drink" => UseAnimation::Drink,
-        _ => UseAnimation::None,
-    }
-}
+pub use horizon_items::use_animation::consumable_animation;
 /// What the click handling reads and does in the world.
 pub trait HandWorld {
     fn hit(&mut self) -> Hit;
diff --git a/crates/horizon-client/src/game.rs b/crates/horizon-client/src/game.rs
index 6b4cd49c2..f234d4d72 100644
--- a/crates/horizon-client/src/game.rs
+++ b/crates/horizon-client/src/game.rs
@@ -107,6 +107,7 @@ mod maps;
 mod minecarts;
 mod mob_blocks;
 mod mob_gear;
+mod mob_sounds;
 mod mod_browser;
 #[cfg(feature = "mods")]
 mod mod_browser_recipes;
@@ -1525,6 +1526,10 @@ struct Game<'a> {
     cart_sounds: HashSet<u32>,
     /// The minecart the riding sounds were started for (`LocalPlayer.startRiding`).
     riding_cart_sounds: Option<u32>,
+    /// Bees whose buzz is playing, and whether it is the aggressive one.
+    bee_sounds: HashMap<u32, bool>,
+    /// Guardians whose attack hum is playing.
+    guardian_sounds: HashSet<u32>,
     dropped: Vec<ItemEntity>,
     next_entity: u32,
     particles: horizon_client::particles::ParticleEngine,
@@ -7833,7 +7838,9 @@ impl Game<'_> {
             self.yaw
         };
         for m in &self.mobs {
-            if m.fire_ticks > 0 && !m.removed {
+            // Blaze.isOnFire: a charged blaze burns.
+            let blazing = m.species() == horizon_client::mobs::Species::Blaze && m.extra.flag;
+            if (m.fire_ticks > 0 || blazing) && !m.removed {
                 let at = m.previous.lerp(m.position, alpha);
                 horizon_client::fire_render::flames(
                     [at.x, at.y, at.z],
@@ -13653,6 +13660,8 @@ impl<'a> Game<'a> {
             sound_paused: false,
             cart_sounds: HashSet::new(),
             riding_cart_sounds: None,
+            bee_sounds: HashMap::new(),
+            guardian_sounds: HashSet::new(),
             dropped: Vec::new(),
             next_entity: 0,
             particles,
diff --git a/crates/horizon-client/src/game/campfire_douse.rs b/crates/horizon-client/src/game/campfire_douse.rs
index 04accb2d3..e3a990b27 100644
--- a/crates/horizon-client/src/game/campfire_douse.rs
+++ b/crates/horizon-client/src/game/campfire_douse.rs
@@ -2,8 +2,60 @@
 //! shovels) put on a lit campfire puts it out.
 use super::Game;
 use horizon_client::{Result, animate_tick::make_campfire_smoke, items::ItemStack};
+use horizon_core::position::BlockPos;
+use horizon_world::chunk::BlockState;
+use winit::keyboard::KeyCode;
 
 impl Game<'_> {
+    /// The lit campfire at `pos` that `held` puts out, when the item is in
+    /// `#minecraft:douses_campfires` (`CampfireBlock.useItemOn`).
+    fn campfire_to_douse(&self, pos: [i32; 3], held: Option<&ItemStack>) -> Option<BlockState> {
+        held.filter(|s| {
+            self.res
+                .items()
+                .item_tags
+                .get("minecraft:douses_campfires")
+                .is_some_and(|members| members.contains(&*s.item))
+        })?;
+        self.pack
+            .assets
+            .registry
+            .state(self.world.block(pos[0], pos[1], pos[2]))
+            .filter(|s| matches!(&*s.name, "minecraft:campfire" | "minecraft:soul_campfire"))
+            .filter(|s| s.properties.get("lit").map(String::as_str) == Some("true"))
+            .cloned()
+    }
+
+    /// `CampfireBlock.useItemOn` as this client runs it before the server's
+    /// answer (`MultiPlayerGameMode.useItemOn`): the twenty smoke puffs of
+    /// `CampfireBlock.douse` and the campfire gone out, kept as predicted
+    /// under `seq`. The level event's sound comes from the server. True when
+    /// it doused (SUCCESS), which ends the click for both hands.
+    pub(super) fn predict_campfire_douse(
+        &mut self,
+        pos: [i32; 3],
+        held: Option<&ItemStack>,
+        seq: i32,
+    ) -> bool {
+        // Player.isSecondaryUseActive: a held item means both hands count.
+        if self.keys.contains(&KeyCode::ShiftLeft) {
+            return false;
+        }
+        let Some(mut state) = self.campfire_to_douse(pos, held) else {
+            return false;
+        };
+        let signal = state.properties.get("signal_fire").map(String::as_str) == Some("true");
+        for _ in 0..20 {
+            make_campfire_smoke(&mut self.particles, pos, signal, true);
+        }
+        state.properties.insert("lit".into(), "false".into());
+        if let Ok(unlit) = self.pack.assets.registry.resolve(&state) {
+            let at = BlockPos::new(pos[0], pos[1], pos[2]);
+            self.predict_blocks(&vec![(at, unlit)], seq);
+        }
+        true
+    }
+
     /// `CampfireBlock.useItemOn` with `held` in the hand that acts, the block
     /// at `pos` clicked: true when it doused a lit campfire (SUCCESS).
     pub(super) fn use_campfire_douse(
@@ -11,24 +63,11 @@ impl Game<'_> {
         pos: [i32; 3],
         held: Option<&ItemStack>,
     ) -> Result<bool> {
-        let Some(tool) = held.filter(|s| {
-            self.res
-                .items()
-                .item_tags
-                .get("minecraft:douses_campfires")
-                .is_some_and(|members| members.contains(&*s.item))
-        }) else {
-            return Ok(false);
-        };
-        let registry = self.pack.assets.registry;
-        let Some(mut state) = registry
-            .state(self.world.block(pos[0], pos[1], pos[2]))
-            .filter(|s| matches!(&*s.name, "minecraft:campfire" | "minecraft:soul_campfire"))
-            .filter(|s| s.properties.get("lit").map(String::as_str) == Some("true"))
-            .cloned()
+        let (Some(used), Some(mut state)) = (held.cloned(), self.campfire_to_douse(pos, held))
         else {
             return Ok(false);
         };
+        let registry = self.pack.assets.registry;
         // Level event 1009 (SOUND_EXTINGUISH_FIRE) goes to every player.
         self.level_event_at(1009, pos, 0);
         // CampfireBlock.douse: the acting client's own smoke (twenty puffs),
@@ -44,7 +83,6 @@ impl Game<'_> {
         if let Ok(unlit) = registry.resolve(&state) {
             self.level_set(pos, unlit)?;
         }
-        let used = tool.clone();
         self.damage_held(1);
         // ServerPlayerGameMode.useItemOn: the action was consumed.
         self.trigger_block("minecraft:item_used_on_block", pos, &used);
diff --git a/crates/horizon-client/src/game/creatures.rs b/crates/horizon-client/src/game/creatures.rs
index a9bf19c07..e483afc94 100644
--- a/crates/horizon-client/src/game/creatures.rs
+++ b/crates/horizon-client/src/game/creatures.rs
@@ -46,6 +46,10 @@ pub(super) struct Creatures {
     pub projectiles: Vec<Projectile>,
     /// Wind bursts from a guest's turn, waiting for it to end (game/wind.rs).
     pub wind_bursts: Vec<super::wind::Burst>,
+    /// The players a fishing hook can catch, taken as the hooks tick, and
+    /// the pulls on them waiting for the hub (game/fishing.rs).
+    pub hook_targets: Vec<super::fishing::HookTarget>,
+    pub hook_pulls: Vec<(u32, horizon_core::geometry::Vec3)>,
     /// Mace smash knockback on the other players from a guest's turn, waiting
     /// for it to end (game/mace.rs).
     pub smash_pushes: Vec<super::mace::SmashPush>,
@@ -226,6 +230,8 @@ impl Game<'_> {
             uuid: self.level.player_uuid.unwrap_or_default(),
             allies: std::sync::Arc::new(self.player_allies()),
             remote: false,
+            sleeping: self.sleeping.is_some(),
+            sleep_timer: self.sleep_timer,
             passenger: self.riding.is_some(),
         })
     }
@@ -1356,6 +1362,22 @@ impl Game<'_> {
                     [0.0, 0.2, 0.0],
                     10,
                 ),
+                MobEvent::DropGift { table, at } => {
+                    let stacks =
+                        self.res
+                            .items()
+                            .loot_table(table, false, None, &mut self.world.random);
+                    for stack in stacks {
+                        // The ItemEntity constructor's random motion.
+                        let r = &mut self.world.random;
+                        let v = [
+                            r.next_double() * 0.2 - 0.1,
+                            0.2,
+                            r.next_double() * 0.2 - 0.1,
+                        ];
+                        self.spawn_item(stack, at, v, 10);
+                    }
+                }
                 // `Level.setBlockAndUpdate`: neighbour and shape updates, so a crop
                 // above trampled farmland breaks and drops.
                 MobEvent::SetBlock { pos, state } => self.level_set(pos, state)?,
@@ -3356,6 +3378,7 @@ impl Game<'_> {
             .item_tags
             .get("minecraft:parrot_poisonous_food")
             .is_some_and(|t| t.contains(&*item));
+        let player_at = self.eye_position();
         let acting = self.acting_player_uuid();
         let sneaking = self.keys.contains(&winit::keyboard::KeyCode::ShiftLeft)
             || self.keys.contains(&winit::keyboard::KeyCode::ShiftRight);
@@ -3688,6 +3711,29 @@ impl Game<'_> {
                     consume = true;
                 }
             }
+            // Parrot.mobInteract: #parrot_poisonous_food (a cookie) poisons the
+            // parrot for 45 s and then hurts it with a player attack of
+            // Float.MAX_VALUE, which an invulnerable one shrugs off.
+            Species::Parrot
+                if self
+                    .res
+                    .items()
+                    .item_tags
+                    .get("minecraft:parrot_poisonous_food")
+                    .is_some_and(|t| t.contains(&*item)) =>
+            {
+                consume = true;
+                m.add_effect("minecraft:poison", 900, 0);
+                let id = m.id;
+                let hurt = m.damage(
+                    f32::MAX,
+                    horizon_client::mobs::Damage::player(player_at.unwrap_or(center)),
+                );
+                // The feeder gets the kill, as for a normal player attack.
+                if hurt {
+                    self.last_hurt_by_player.insert(id, self.lan_acting);
+                }
+            }
             // Parrot.mobInteract: parrot food may tame a wild one (one time in
             // ten); a parrot never takes it as Animal food (isFood is false).
             Species::Parrot if !m.extra.tame && is_food => {
diff --git a/crates/horizon-client/src/game/enchant_effects.rs b/crates/horizon-client/src/game/enchant_effects.rs
index 6986c5627..806f193e5 100644
--- a/crates/horizon-client/src/game/enchant_effects.rs
+++ b/crates/horizon-client/src/game/enchant_effects.rs
@@ -215,6 +215,106 @@ impl Game<'_> {
         }
         self.post_attack_bursts(&held, &kind);
     }
+    /// `EnchantmentHelper.doPostPiercingAttackEffects`: the
+    /// `minecraft:post_piercing_attack` effects of the weapon in hand after a
+    /// jab (Lunge's dash).
+    pub(super) fn post_piercing_attack(&mut self) {
+        let Some(held) = self.held().cloned() else {
+            return;
+        };
+        let mut effects = Vec::new();
+        for (id, level) in held.enchantments() {
+            let Some(def) = self.res.stations().enchantments.get(id) else {
+                continue;
+            };
+            for entry in def.effects["minecraft:post_piercing_attack"]
+                .as_array()
+                .into_iter()
+                .flatten()
+            {
+                effects.push((*level, entry["effect"].clone()));
+            }
+        }
+        // Lunge's requirements: not riding, gliding or in water, and a
+        // player outside creative with at least 7 food.
+        let Some(p) = self.player.as_ref() else {
+            return;
+        };
+        if effects.is_empty()
+            || self.riding.is_some()
+            || p.fall_flying
+            || p.fluids.was_touching_water
+            || !(self.creative || p.health.food.food >= 7)
+        {
+            return;
+        }
+        for (level, effect) in effects {
+            self.apply_piercing_effect(&effect, level);
+        }
+    }
+    /// One `post_piercing_attack` effect on the player: `AllOf`,
+    /// `ChangeItemDamage`, `ApplyExhaustion`, `ApplyEntityImpulse` and
+    /// `PlaySoundEffect`.
+    fn apply_piercing_effect(&mut self, effect: &serde_json::Value, level: u32) {
+        let amount = || level_value(&effect["amount"], level);
+        match effect["type"].as_str() {
+            Some("minecraft:all_of") => {
+                for e in effect["effects"].as_array().into_iter().flatten() {
+                    self.apply_piercing_effect(e, level);
+                }
+            }
+            Some("minecraft:change_item_damage") => self.damage_held(amount() as u32),
+            Some("minecraft:apply_exhaustion") => {
+                if let Some(p) = self.player.as_mut() {
+                    p.cause_food_exhaustion(amount());
+                }
+            }
+            // The direction turned by the look (`Entity.getLookQuaternion`:
+            // pitch about x, then yaw about y), scaled by coordinate_scale
+            // and the magnitude, added to the velocity (the guest's client
+            // is told of it by `guest_hit_by`).
+            Some("minecraft:apply_impulse") => {
+                let vec3 = |key: &str| [0, 1, 2].map(|i| effect[key][i].as_f64().unwrap_or(0.0));
+                let (d, scale) = (vec3("direction"), vec3("coordinate_scale"));
+                let magnitude = f64::from(level_value(&effect["magnitude"], level));
+                let (yaw, pitch) = (
+                    f64::from(self.yaw).to_radians(),
+                    f64::from(self.pitch).to_radians(),
+                );
+                let (y1, z1) = (
+                    d[1] * pitch.cos() - d[2] * pitch.sin(),
+                    d[1] * pitch.sin() + d[2] * pitch.cos(),
+                );
+                let impulse = horizon_core::geometry::Vec3::new(
+                    (d[0] * yaw.cos() - z1 * yaw.sin()) * scale[0] * magnitude,
+                    y1 * scale[1] * magnitude,
+                    (d[0] * yaw.sin() + z1 * yaw.cos()) * scale[2] * magnitude,
+                );
+                if let Some(p) = self.player.as_mut() {
+                    p.velocity = p.velocity.add_vector(impulse);
+                }
+            }
+            // The sound for the level (a list picks by level), heard by all.
+            Some("minecraft:play_sound") => {
+                let sounds: Vec<&str> = match &effect["sound"] {
+                    serde_json::Value::Array(list) => {
+                        list.iter().filter_map(|s| s.as_str()).collect()
+                    }
+                    one => one.as_str().into_iter().collect(),
+                };
+                let index = (level as usize).saturating_sub(1);
+                if let Some(sound) = sounds.get(index.min(sounds.len().saturating_sub(1))) {
+                    let float = |key: &str| effect[key].as_f64().unwrap_or(1.0) as f32;
+                    let at = self
+                        .player
+                        .as_ref()
+                        .map(|p| [p.position.x, p.position.y, p.position.z]);
+                    self.audio.play(sound, at, float("volume"), float("pitch"));
+                }
+            }
+            _ => {}
+        }
+    }
     /// `ApplyMobEffect.apply`: one of `to_apply` (a single id or a list) for a
     /// random duration and amplifier between the level-based bounds.
     fn apply_mob_effect(&mut self, mob: usize, effect: &serde_json::Value, level: u32) {
diff --git a/crates/horizon-client/src/game/fishing.rs b/crates/horizon-client/src/game/fishing.rs
index fa2627693..742d05c27 100644
--- a/crates/horizon-client/src/game/fishing.rs
+++ b/crates/horizon-client/src/game/fishing.rs
@@ -1,7 +1,7 @@
 //! Fishing: `FishingRodItem.use` (cast / reel in), the `FishingHook` (flight,
 //! bobbing, lure and bite timers, open water, hooking mobs, retrieving the
 //! `gameplay/fishing` loot) and `FishingHookRenderer` (bobber and line).
-use super::{Game, view_vector};
+use super::{Game, lan::LanHost, lan_mobs::guest_bounds, view_vector};
 use horizon_client::advancements::EntityView;
 use horizon_client::lan::{entity::States, hub::Hub};
 use horizon_client::{
@@ -47,6 +47,13 @@ pub(super) struct Hook {
     luck: i32,
     lure: i32,
 }
+/// A player a hook can catch (`canHitEntity`): their entity id, which
+/// guest they are (none: the host) and their box.
+pub(super) struct HookTarget {
+    id: u32,
+    conn: Option<u32>,
+    bounds: Aabb,
+}
 const SIZE: f64 = 0.25;
 fn bounds(p: Vec3) -> Aabb {
     let h = SIZE / 2.0;
@@ -168,6 +175,11 @@ impl Game<'_> {
             } else if let Some(item) = self.dropped.iter_mut().find(|i| i.id == id) {
                 item.velocity = pulled(item.velocity);
                 hooked_item = true;
+            } else if self.creatures.hook_targets.iter().any(|t| t.id == id) {
+                // A player: the hub moves them when the tick ends.
+                self.creatures
+                    .hook_pulls
+                    .push((id, Vec3::new(d.x * 0.1, d.y * 0.1, d.z * 0.1)));
             }
             // CriteriaTriggers.FISHING_ROD_HOOKED with no items.
             let hooked = self
@@ -476,6 +488,15 @@ impl Game<'_> {
         if !self.holds_rod() || d2 > 1024.0 {
             return;
         }
+        // The players it can catch, as they stand now (the host's own hook;
+        // guests' hooks use the ones taken as their turns start).
+        if self.lan_acting.is_none()
+            && matches!(h.state, State::Flying | State::Hooked(_))
+            && let Some(host) = self.lan.take()
+        {
+            self.refresh_hook_targets(&host);
+            self.lan = Some(host);
+        }
         h.previous = h.position;
         if h.on_ground {
             h.life += 1;
@@ -501,8 +522,8 @@ impl Game<'_> {
                     self.hook = Some(h);
                     return;
                 }
-                // checkCollision: hook the first living mob it touches, or (via
-                // `canHitEntity`) a dropped item.
+                // checkCollision: hook the first living mob or other player it
+                // touches, or (via `canHitEntity`) a dropped item.
                 let bb = bounds(h.position);
                 let (lo, hi) = (bb.min_position(), bb.max_position());
                 let touches = |b: Aabb| {
@@ -514,6 +535,14 @@ impl Game<'_> {
                     .iter()
                     .find(|m| m.alive() && touches(m.bounds()))
                     .map(|m| m.id)
+                    .or_else(|| {
+                        let owner = self.lan_acting;
+                        self.creatures
+                            .hook_targets
+                            .iter()
+                            .find(|t| t.conn != owner && touches(t.bounds))
+                            .map(|t| t.id)
+                    })
                     .or_else(|| {
                         self.dropped
                             .iter()
@@ -528,12 +557,25 @@ impl Game<'_> {
                 }
             }
             State::Hooked(id) => {
-                // updateHookedEntity: ride the hooked mob or item at 0.8 of its height.
+                // updateHookedEntity: ride the hooked mob, player or item at 0.8 of its height.
                 let hooked = self
                     .mobs
                     .iter()
                     .find(|m| m.id == id && m.alive())
                     .map(|m| (m.position, f64::from(m.height())))
+                    .or_else(|| {
+                        self.creatures
+                            .hook_targets
+                            .iter()
+                            .find(|t| t.id == id)
+                            .map(|t| {
+                                let (lo, hi) = (t.bounds.min_position(), t.bounds.max_position());
+                                (
+                                    Vec3::new((lo.x + hi.x) / 2.0, lo.y, (lo.z + hi.z) / 2.0),
+                                    hi.y - lo.y,
+                                )
+                            })
+                    })
                     .or_else(|| {
                         self.dropped
                             .iter()
@@ -602,6 +644,59 @@ impl Game<'_> {
         );
         self.hook = Some(h);
     }
+    /// The players a hook can catch: everyone but spectators and the dead
+    /// (`Projectile.canHitEntity`), the host and the guests in the level.
+    pub(super) fn refresh_hook_targets(&mut self, host: &LanHost) {
+        let mut targets = Vec::new();
+        if self.options.dedicated.is_none()
+            && !self.spectator()
+            && let Some(p) = self.player.as_ref()
+            && !p.health.dead_or_dying()
+        {
+            targets.push(HookTarget {
+                id: host.host_entity as u32,
+                conn: None,
+                bounds: p.bounds(),
+            });
+        }
+        for g in &host.hub.guests {
+            if host.hub.here(g) && g.loaded && !g.dead && !g.spectator() {
+                targets.push(HookTarget {
+                    id: g.entity_id as u32,
+                    conn: Some(g.conn),
+                    bounds: guest_bounds(g),
+                });
+            }
+        }
+        self.creatures.hook_targets = targets;
+    }
+    /// `FishingHook.pullEntity` on the players the hooks reeled in this tick
+    /// pulled: their velocity moves, and a guest's reaches their client.
+    pub(super) fn flush_hook_pulls(&mut self) {
+        let pulls = std::mem::take(&mut self.creatures.hook_pulls);
+        let Some(mut host) = self.lan.take() else {
+            return;
+        };
+        for (id, delta) in pulls {
+            let push = |g: &mut Self| {
+                if let Some(p) = g.player.as_mut() {
+                    p.velocity = p.velocity.add_vector(delta);
+                }
+            };
+            if id == host.host_entity as u32 {
+                push(self);
+            } else if let Some(conn) = host
+                .hub
+                .guests
+                .iter()
+                .find(|g| g.entity_id as u32 == id)
+                .map(|g| g.conn)
+            {
+                self.guest_hit_by(&mut host, conn, push);
+            }
+        }
+        self.lan = Some(host);
+    }
     /// `FishingRodCast`: the stack in the arm holding the rod
     /// (`FishingHookRenderer.getHoldingArm`) while the hook is out.
     pub(super) fn cast_rod(&self) -> Option<&ItemStack> {
diff --git a/crates/horizon-client/src/game/hand.rs b/crates/horizon-client/src/game/hand.rs
index e7bb1982f..40ca9d559 100644
--- a/crates/horizon-client/src/game/hand.rs
+++ b/crates/horizon-client/src/game/hand.rs
@@ -403,6 +403,12 @@ struct GameHands<'g, 'a> {
     error: Option<Box<dyn std::error::Error>>,
 }
 impl GameHands<'_, '_> {
+    /// The main-hand item's `kinetic_weapon` and `piercing_weapon`, a spear's.
+    fn attack_kinetic(&self) -> Option<horizon_client::spear::Kinetic> {
+        self.game
+            .held()
+            .and_then(|s| horizon_client::spear::Kinetic::of(&s.item))
+    }
     fn keep(&mut self, r: Result<()>) {
         if let Err(e) = r
             && self.error.is_none()
@@ -470,18 +476,27 @@ impl HandWorld for GameHands<'_, '_> {
         self.game.creative
     }
     fn cannot_attack(&mut self) -> bool {
-        false
+        let ticker = self.game.hand_strength.ticker;
+        self.game.cannot_attack_with_item(ticker, 0)
     }
     fn piercing_weapon(&mut self) -> bool {
-        false
+        self.attack_kinetic().is_some()
     }
     fn attack_animation(&mut self) -> SwingAnimation {
-        SwingAnimation::DEFAULT
+        self.attack_kinetic()
+            .map_or(SwingAnimation::DEFAULT, |k| k.attack_animation())
     }
     fn interact_animation(&mut self, _: Hand) -> SwingAnimation {
         SwingAnimation::DEFAULT
     }
-    fn piercing_attack(&mut self, _: SwingAnimation) {}
+    fn piercing_attack(&mut self, _: SwingAnimation) {
+        // The server's part (`PiercingWeapon.attack`), then the client's:
+        // the sound `MultiPlayerGameMode.piercingAttack` plays.
+        if let Some(sound) = self.game.jab() {
+            self.game.play_at_feet(sound);
+        }
+        self.game.hand_strength.reset_attack();
+    }
     fn attack_entity(&mut self) -> bool {
         self.game.attack()
     }
diff --git a/crates/horizon-client/src/game/item_draw.rs b/crates/horizon-client/src/game/item_draw.rs
index 99d67493b..be0ca56fb 100644
--- a/crates/horizon-client/src/game/item_draw.rs
+++ b/crates/horizon-client/src/game/item_draw.rs
@@ -165,13 +165,16 @@ pub(super) fn owner_at(position: [f64; 3], yaw: f32, entity_type: &str) -> Owner
         ..Default::default()
     }
 }
-/// `UseDuration` of a stack: 72000 for drawn items, the consume time for food.
+/// `UseDuration` of a stack (`Item.getUseDuration`): 72000 for drawn items
+/// and for `blocks_attacks` items (shields), the consume time for food.
 fn use_duration(components: &Components) -> i32 {
     if let Some(c) = components.get("minecraft:consumable") {
         let seconds = c["consume_seconds"].as_f64().unwrap_or(1.6);
         return (seconds * 20.0) as i32;
     }
-    if components.get("minecraft:kinetic_weapon").is_some() {
+    if components.get("minecraft:blocks_attacks").is_some()
+        || components.get("minecraft:kinetic_weapon").is_some()
+    {
         return 72_000;
     }
     let item_model = components
diff --git a/crates/horizon-client/src/game/lan.rs b/crates/horizon-client/src/game/lan.rs
index ac5f8a13a..83fdaf4be 100644
--- a/crates/horizon-client/src/game/lan.rs
+++ b/crates/horizon-client/src/game/lan.rs
@@ -14,7 +14,7 @@ use horizon_client::{
         hub::{BodyFlags, HostEvent, HostState, Hub, HubConfig, TickCtx},
         playerdata,
     },
-    mobs::{Mob, Who, leash::Holder},
+    mobs::{Mob, Species, Who, leash::Holder},
     text::Text,
 };
 use horizon_core::geometry::Vec3;
@@ -168,6 +168,7 @@ pub(super) fn baby_index(kind: &str) -> Option<u8> {
         | "minecraft:zombie_villager"
         | "minecraft:zombified_piglin"
         | "minecraft:hoglin"
+        | "minecraft:zoglin"
         | "minecraft:goat"
         | "minecraft:ocelot"
         | "minecraft:turtle"
@@ -324,9 +325,13 @@ fn mob_meta(
     defaults: &mut Vec<(u8, i32, Value)>,
 ) {
     let kind = m.kind.id.as_str();
-    // Entity.DATA_SHARED_FLAGS_ID: on fire 0x01, glowing 0x40
-    // (LivingEntity.updateGlowingStatus).
-    let shared = i8::from(m.fire_ticks > 0) | i8::from(m.is_currently_glowing()) << 6;
+    // Entity.DATA_SHARED_FLAGS_ID: on fire 0x01, swimming 0x10 (a drowned
+    // under water, `Drowned.setSwimming`), invisible 0x20 (the effect's flag)
+    // and glowing 0x40 (LivingEntity.updateGlowingStatus).
+    let shared = i8::from(m.fire_ticks > 0)
+        | i8::from(m.species() == Species::Drowned && m.extra.flag) << 4
+        | i8::from(m.invisible || horizon_client::mobs::trader::is_invisible(m)) << 5
+        | i8::from(m.is_currently_glowing()) << 6;
     if shared != 0 {
         meta.push((0, serializer::BYTE, Value::Byte(shared)));
     }
@@ -336,6 +341,12 @@ fn mob_meta(
     if pose != 0 {
         meta.push((6, serializer::POSE, Value::Id(i32::from(pose))));
     }
+    // LivingEntity.DATA_SLEEPING_POS_ID: the bed a sleeping villager lies in.
+    if horizon_client::mobs::villager::sleeping(m)
+        && let Some(bed) = m.extra.bed
+    {
+        meta.push((14, serializer::OPTIONAL_BLOCK_POS, Value::OptPos(Some(bed))));
+    }
     if let Some(name) = &m.custom_name {
         meta.push((
             2,
@@ -430,8 +441,14 @@ fn mob_meta(
             }
             defaults.push((17, serializer::INT, Value::Int(0)));
         }
-        // Piglin.DATA_IS_DANCING (after the baby flag and the crossbow charge).
+        // AbstractPiglin.DATA_IMMUNE_TO_ZOMBIFICATION (16: with the dimension it
+        // makes it shake) and Piglin.DATA_IS_DANCING (after the baby flag and
+        // the crossbow charge).
         "minecraft:piglin" => {
+            if e.flag2 {
+                meta.push((16, serializer::BOOLEAN, Value::Bool(true)));
+            }
+            defaults.push((16, serializer::BOOLEAN, Value::Bool(false)));
             if e.scratch[0] > 0 {
                 meta.push((19, serializer::BOOLEAN, Value::Bool(true)));
             }
@@ -485,6 +502,15 @@ fn mob_meta(
             if let Some(v) = id(registry, name) {
                 meta.push((index, serializer, Value::Id(v)));
             }
+            // Cat.IS_LYING and RELAX_STATE_ONE.
+            if kind == "minecraft:cat" {
+                for (index, on) in [(21, e.flag), (22, e.relax_one)] {
+                    if on {
+                        meta.push((index, serializer::BOOLEAN, Value::Bool(true)));
+                    }
+                    defaults.push((index, serializer::BOOLEAN, Value::Bool(false)));
+                }
+            }
             // Wolf.DATA_COLLAR_COLOR and Cat's, red by default.
             let collar = if kind == "minecraft:cat" { 23 } else { 21 };
             let red = i32::from(horizon_client::mobs::tame::RED);
@@ -509,10 +535,16 @@ fn mob_meta(
         | "minecraft:skeleton_horse"
         | "minecraft:zombie_horse"
         | "minecraft:camel" => {
-            // AbstractHorse.DATA_ID_FLAGS: tame 2.
-            if e.tame {
-                meta.push((18, serializer::BYTE, Value::Byte(2)));
+            // AbstractHorse.DATA_ID_FLAGS: tame 2, eating 16 (grazing), standing
+            // 32 (rearing).
+            let grazes = horizon_client::mobs::equine::grazes(m.species());
+            let flags = if e.tame { 2 } else { 0 }
+                | if grazes && e.flag { 16 } else { 0 }
+                | if grazes && e.counter > 0 { 32 } else { 0 };
+            if flags != 0 {
+                meta.push((18, serializer::BYTE, Value::Byte(flags)));
             }
+            defaults.push((18, serializer::BYTE, Value::Byte(0)));
             if kind == "minecraft:horse" {
                 let v = i32::from(e.variant) | i32::from(e.variant2) << 8;
                 if v != 0 {
@@ -545,6 +577,15 @@ fn mob_meta(
         // Villager.DATA_VILLAGER_DATA and ZombieVillager's (after Zombie's three).
         "minecraft:villager" | "minecraft:zombie_villager" => {
             use horizon_client::mobs::render::{PROFESSIONS, VILLAGER_TYPES};
+            if kind == "minecraft:villager" {
+                unhappy_counter(m, meta, defaults);
+            } else {
+                // ZombieVillager.DATA_CONVERTING_ID: the cure's shaking.
+                if horizon_client::mobs::zombie_villager::is_converting(m) {
+                    meta.push((19, serializer::BOOLEAN, Value::Bool(true)));
+                }
+                defaults.push((19, serializer::BOOLEAN, Value::Bool(false)));
+            }
             let villager_type = VILLAGER_TYPES[e.variant as usize % VILLAGER_TYPES.len()];
             let profession = PROFESSIONS[e.variant2 as usize % PROFESSIONS.len()];
             if let (Some(t), Some(p)) = (
@@ -752,6 +793,60 @@ fn mob_meta(
                 meta.push((17, serializer::BOOLEAN, Value::Bool(true)));
             }
             defaults.push((17, serializer::BOOLEAN, Value::Bool(false)));
+            defaults.push((16, serializer::OPTIONAL_BLOCK_STATE, Value::Id(0)));
+        }
+        // Zombie.DATA_DROWNED_CONVERSION_ID (after DATA_BABY_ID and
+        // DATA_SPECIAL_TYPE_ID): the shaking of the conversion under water.
+        "minecraft:zombie" | "minecraft:husk" => {
+            if e.counter2 > 0 {
+                meta.push((18, serializer::BOOLEAN, Value::Bool(true)));
+            }
+            defaults.push((18, serializer::BOOLEAN, Value::Bool(false)));
+        }
+        // AbstractVillager.DATA_UNHAPPY_COUNTER (after AgeableMob's two).
+        "minecraft:wandering_trader" => unhappy_counter(m, meta, defaults),
+        // Hoglin.DATA_IMMUNE_TO_ZOMBIFICATION (after AgeableMob's two) and
+        // AbstractPiglin's, the first entry of its subclasses (the piglin's is
+        // in its own arm): with the dimension it makes them shake.
+        "minecraft:hoglin" | "minecraft:piglin_brute" => {
+            let index = if kind == "minecraft:hoglin" { 18 } else { 16 };
+            if e.flag2 {
+                meta.push((index, serializer::BOOLEAN, Value::Bool(true)));
+            }
+            defaults.push((index, serializer::BOOLEAN, Value::Bool(false)));
+        }
+        // Blaze.DATA_FLAGS_ID: charged 1, which makes it burn.
+        "minecraft:blaze" => {
+            if e.flag {
+                meta.push((16, serializer::BYTE, Value::Byte(1)));
+            }
+            defaults.push((16, serializer::BYTE, Value::Byte(0)));
+        }
+        // Turtle.HAS_EGG and LAYING_EGG (after AgeableMob's two).
+        "minecraft:turtle" => {
+            if e.flag {
+                meta.push((18, serializer::BOOLEAN, Value::Bool(true)));
+            }
+            if e.flag2 {
+                meta.push((19, serializer::BOOLEAN, Value::Bool(true)));
+            }
+            defaults.push((18, serializer::BOOLEAN, Value::Bool(false)));
+            defaults.push((19, serializer::BOOLEAN, Value::Bool(false)));
+        }
+        // WitherBoss.DATA_TARGET_B and DATA_TARGET_C (after DATA_TARGET_A, the
+        // main target): the entities the side heads look at, by id.
+        "minecraft:wither" => {
+            for (k, index) in [(0, 17), (1, 18)] {
+                let target = match e.ints[k] {
+                    0 => None,
+                    -1 => player_entity,
+                    id => Some(id),
+                };
+                if let Some(target) = target {
+                    meta.push((index, serializer::INT, Value::Int(target)));
+                }
+                defaults.push((index, serializer::INT, Value::Int(0)));
+            }
         }
         _ => {}
     }
@@ -769,6 +864,19 @@ fn mob_meta(
     }
 }
 
+/// AbstractVillager.DATA_UNHAPPY_COUNTER (after AgeableMob's two): the head
+/// shake of a villager saying no counts it down from 40.
+fn unhappy_counter(
+    m: &Mob,
+    meta: &mut Vec<(u8, i32, Value)>,
+    defaults: &mut Vec<(u8, i32, Value)>,
+) {
+    if m.extra.ints[0] > 0 {
+        meta.push((18, serializer::INT, Value::Int(m.extra.ints[0])));
+    }
+    defaults.push((18, serializer::INT, Value::Int(0)));
+}
+
 /// What a client shakes a mob by: Entity.DATA_TICKS_FROZEN (7), whose full
 /// count is `isFullyFrozen`, and Strider.DATA_SUFFOCATING (19, after
 /// AgeableMob's two and DATA_BOOST_TIME).
@@ -1603,6 +1711,8 @@ impl Game<'_> {
         let _ = self.flush_wind_bursts();
         // A sweep attack's reach to the other players from a guest's attack.
         self.flush_sweeps();
+        // A reeled-in hook pulling a player.
+        self.flush_hook_pulls();
         // Particles a guest's turn sent (sweep attack, damage indicator, a hook's splashes).
         self.flush_lan_particles();
     }
@@ -1743,6 +1853,11 @@ impl Game<'_> {
         if self.audio.capture.is_some() {
             self.lan_entity_events.push((id, event, at));
         }
+        // Event 21: a window that simulates the world itself is its own
+        // client, and hears the guardian's hum too.
+        if event == 21 && self.options.execution_role.is_client() {
+            self.start_guardian_sound(id as u32);
+        }
     }
     /// `ServerPlayer.crit` (or `magicCrit` when `magic`): this window's
     /// emitter, and an animation for the attacker's client and observers once
@@ -2019,6 +2134,8 @@ impl Game<'_> {
                 .get(g.selected)
                 .and_then(|s| s.as_ref())
                 .is_some_and(|s| s.data().is_some_and(|d| !d.charged.is_empty()));
+            // ClientInformation.mainHand (HumanoidArm: 0 left, 1 right).
+            m.extra.main_hand_left = g.info.main_hand == 0;
             // LivingEntity.DATA_EFFECT_PARTICLES: the swirls of its visible effects.
             let visible = || g.effects.list.iter().filter(|e| e.visible);
             m.extra.effect_particles = visible()
@@ -2043,6 +2160,18 @@ impl Game<'_> {
             let using = host.play.get(&g.conn).and_then(|p| p.using());
             m.extra.using_item = using.map_or(0, |(_, ticks)| ticks as i32 + 1);
             m.extra.using_off_hand = using.is_some_and(|(slot, _)| slot == OFFHAND_SLOT);
+            // AvatarRenderer.getArmPose: the used item's BLOCK animation (an
+            // item with `blocks_attacks`) raises the arm.
+            m.extra.blocking = using
+                .and_then(|(slot, _)| {
+                    if slot == OFFHAND_SLOT {
+                        m.extra.off_hand.as_ref()
+                    } else {
+                        m.extra.main_hand.as_ref()
+                    }
+                })
+                .and_then(|i| self.res.items().get(i))
+                .is_some_and(|i| i.blocks_attacks.is_some());
         }
     }
 
diff --git a/crates/horizon-client/src/game/lan_actions.rs b/crates/horizon-client/src/game/lan_actions.rs
index c18abba36..69d158123 100644
--- a/crates/horizon-client/src/game/lan_actions.rs
+++ b/crates/horizon-client/src/game/lan_actions.rs
@@ -1133,6 +1133,8 @@ impl Game<'_> {
                         g.player_on_equip("mainhand", offhand.as_ref(), main.as_ref());
                     });
                 }
+                // STAB: `PiercingWeapon.attack` of a left click with a spear.
+                8 if !spectator => self.guest_jab(host, conn),
                 _ => {}
             },
             S::SetCarriedItem(p) => {
@@ -1676,6 +1678,37 @@ impl Game<'_> {
         Some((centre, eye))
     }
 
+    /// `ServerGamePacketListenerImpl.handlePlayerAction` for STAB: the spear in
+    /// the guest's main hand jabs once its charge allows it (with five ticks
+    /// of tolerance). The guest's client is sent the dash Lunge gave them.
+    fn guest_jab(&mut self, host: &mut LanHost, conn: u32) {
+        let Some(g) = host.hub.guest(conn) else {
+            return;
+        };
+        let at = g.position;
+        // ServerPlayer.getKnownMovement: the move their client just sent.
+        let movement = g
+            .moves
+            .last()
+            .map_or(Vec3::ZERO, |m| Vec3::new(m.0[0], m.0[1], m.0[2]));
+        let sound = self
+            .guest_hit_by(host, conn, |g| {
+                g.known_movement = movement;
+                if g.cannot_attack_with_item(g.attack_ticks as i32, 5) {
+                    None
+                } else {
+                    g.jab()
+                }
+            })
+            .flatten();
+        // PiercingWeapon.makeSound: `playSound(causer, ...)`, so the guest's
+        // own client plays it.
+        if let Some(name) = sound {
+            let source = horizon_client::settings::sound_source(name) as i32;
+            host.hub.sound(name, at, 1.0, 1.0, source, Some(conn));
+        }
+    }
+
     fn guest_attack(&mut self, host: &mut LanHost, conn: u32, id: i32) {
         let Some(gi) = host.hub.guests.iter().position(|g| g.conn == conn) else {
             return;
@@ -2081,6 +2114,10 @@ impl Game<'_> {
             .filter(|g| host.hub.here(g) && g.loaded)
             .map(|g| g.conn)
             .collect();
+        // The players the guests' hooks can catch.
+        if host.play.values().any(|p| p.hook.is_some()) {
+            self.refresh_hook_targets(host);
+        }
         for conn in conns {
             let Some(gi) = host.hub.guests.iter().position(|g| g.conn == conn) else {
                 continue;
@@ -3160,7 +3197,8 @@ impl Game<'_> {
                 let packet = swing_packet(id, c.hand, c.animation);
                 host.hub.broadcast_near(at, 128.0, &packet, Some(conn));
                 if let Some(m) = host.models.get_mut(&conn) {
-                    m.swing();
+                    // The duration already counts the guest's haste or fatigue.
+                    m.swing_hand(c.hand == Hand::Off, c.duration_ticks);
                 }
             }
             play.swing.tick();
diff --git a/crates/horizon-client/src/game/lan_mobs.rs b/crates/horizon-client/src/game/lan_mobs.rs
index 8dd77dde7..48c6e2145 100644
--- a/crates/horizon-client/src/game/lan_mobs.rs
+++ b/crates/horizon-client/src/game/lan_mobs.rs
@@ -26,6 +26,20 @@ pub(super) fn player_for(
     guests: &GuestViews,
     bound: Option<u32>,
 ) -> Option<u32> {
+    // A tame cat reads its owner wherever they are while they sleep, or just
+    // woke up (`CatRelaxOnOwnerGoal` uses `getOwner`, not the nearest player).
+    if m.species() == Species::Cat
+        && m.extra.tame
+        && let Some(owner) = m.extra.owner
+    {
+        let asleep = |v: &PlayerView| v.uuid == owner && (v.sleeping || v.sleep_timer > 0);
+        if host.is_some_and(asleep) {
+            return None;
+        }
+        if let Some((conn, _)) = guests.iter().find(|(_, v)| asleep(v)) {
+            return Some(*conn);
+        }
+    }
     let targeting = m.ai.target == Some(Who::Player)
         || m.ai.last_hurt_by == Some(Who::Player) && m.age as i32 - m.ai.last_hurt_by_time <= 100;
     // A tame wolf or cat sees its owner (`TamableAnimal.getOwner`), while they
@@ -399,6 +413,8 @@ mod tests {
             uuid: [0; 4],
             allies: Default::default(),
             remote: false,
+            sleeping: false,
+            sleep_timer: 0,
             passenger: false,
         }
     }
diff --git a/crates/horizon-client/src/game/mob_sounds.rs b/crates/horizon-client/src/game/mob_sounds.rs
new file mode 100644
index 000000000..50065d94f
--- /dev/null
+++ b/crates/horizon-client/src/game/mob_sounds.rs
@@ -0,0 +1,82 @@
+//! The looping sound instances of mobs: a bee's buzz
+//! (`ClientPacketListener.postAddEntitySoundInstance`) and a guardian's
+//! attack hum (entity event 21). The sound engine ticks them with what
+//! `start_mob_sounds` reads off the mobs.
+use super::Game;
+use horizon_client::{
+    mobs::{Species, bee, guardian},
+    sound_engine::{MobSound, SoundEngine, SoundInstance, Sounds},
+};
+
+impl Game<'_> {
+    /// Start the buzz of each bee that has none (or whose anger changed, which
+    /// swaps the flying loop for the aggressive one and back), forget the mobs
+    /// that are gone, and read what the instances follow.
+    pub(super) fn start_mob_sounds(&mut self) -> Vec<MobSound> {
+        let game_time = self.world.game_time;
+        let mobs: Vec<MobSound> = self
+            .mobs
+            .iter()
+            .filter(|m| {
+                !m.removed
+                    && matches!(
+                        m.species(),
+                        Species::Bee | Species::Guardian | Species::ElderGuardian
+                    )
+            })
+            .map(|m| MobSound {
+                id: m.id,
+                position: [m.position.x, m.position.y, m.position.z],
+                // Vec3.horizontalDistance.
+                speed: m.velocity.x.hypot(m.velocity.z),
+                baby: m.is_baby(),
+                // NeutralMob.isAngry: the anger end time is ahead.
+                angry: m.species() == Species::Bee
+                    && bee::get(m).is_some_and(|b| b.anger_end > 0 && b.anger_end - game_time > 0),
+                silent: m.silent,
+                attack_scale: guardian::attack_scale(m),
+            })
+            .collect();
+        self.guardian_sounds
+            .retain(|id| mobs.iter().any(|m| m.id == *id));
+        self.bee_sounds
+            .retain(|id, _| mobs.iter().any(|m| m.id == *id));
+        for sound in &mobs {
+            let is_bee = self
+                .mobs
+                .iter()
+                .any(|m| m.id == sound.id && m.species() == Species::Bee);
+            if is_bee && self.bee_sounds.get(&sound.id) != Some(&sound.angry) {
+                self.bee_sounds.insert(sound.id, sound.angry);
+                let instance = SoundInstance::bee(sound, sound.angry, SoundEngine::unseeded());
+                self.audio.play_instance(instance, false);
+            }
+        }
+        mobs
+    }
+
+    /// `ClientPacketListener.handleEntityEvent` 21: a guardian's attack
+    /// hum starts (one loop per guardian; the loops of its earlier beams are
+    /// the same loop, as each one follows the guardian's charge).
+    pub(super) fn start_guardian_sound(&mut self, id: u32) {
+        let Some(m) = self.mobs.iter().find(|m| {
+            m.id == id && matches!(m.species(), Species::Guardian | Species::ElderGuardian)
+        }) else {
+            return;
+        };
+        if !self.guardian_sounds.insert(id) {
+            return;
+        }
+        let sound = MobSound {
+            id,
+            position: [m.position.x, m.position.y, m.position.z],
+            speed: 0.0,
+            baby: false,
+            angry: false,
+            silent: m.silent,
+            attack_scale: guardian::attack_scale(m),
+        };
+        let instance = SoundInstance::guardian_attack(&sound, SoundEngine::unseeded());
+        self.audio.play_instance(instance, false);
+    }
+}
diff --git a/crates/horizon-client/src/game/music.rs b/crates/horizon-client/src/game/music.rs
index 97ca3763e..6e303e7d3 100644
--- a/crates/horizon-client/src/game/music.rs
+++ b/crates/horizon-client/src/game/music.rs
@@ -34,11 +34,13 @@ impl Game<'_> {
             self.sound_paused = self.pause;
         }
         let (vehicle, carts) = self.start_cart_sounds();
+        let mobs = self.start_mob_sounds();
         let ctx = TickContext {
             player_underwater: self.ambience.was_underwater(),
             player_removed: self.player.is_none(),
             vehicle,
             carts,
+            mobs,
             frozen: !self.clock.runs_normally(),
         };
         self.audio.tick(self.pause, &ctx);
diff --git a/crates/horizon-client/src/game/remote.rs b/crates/horizon-client/src/game/remote.rs
index 3191097e5..988fb438c 100644
--- a/crates/horizon-client/src/game/remote.rs
+++ b/crates/horizon-client/src/game/remote.rs
@@ -2097,6 +2097,13 @@ impl Game<'_> {
                                 m.extra.ints[1] = code;
                             }
                         }
+                        // Avatar.DATA_PLAYER_MAIN_HAND (HumanoidArm: 0 left, 1
+                        // right): the arm a swing of the main hand moves.
+                        if let (15, Value::Id(arm)) = (index, value)
+                            && let Some(m) = self.mobs.iter_mut().find(|m| m.id == p.id as u32)
+                        {
+                            m.extra.main_hand_left = *arm == 0;
+                        }
                     }
                 }
                 // LivingEntity.onSyncedDataUpdated(SLEEPING_POS_ID): this
@@ -2321,6 +2328,10 @@ impl Game<'_> {
                 if p.event == 69 {
                     self.remote_ravager_roar(p.id);
                 }
+                // ClientPacketListener.handleEntityEvent 21: a guardian's hum.
+                if p.event == 21 {
+                    self.start_guardian_sound(p.id as u32);
+                }
                 if p.event == 1
                     && let Some(m) = self.mobs.iter_mut().find(|m| m.id == p.id as u32)
                     && m.species() == horizon_client::mobs::Species::Rabbit
@@ -2421,7 +2432,7 @@ impl Game<'_> {
                 if self.remote.as_ref().is_some_and(|r| r.entity_id == p.id) {
                     self.swing_hand(hand, animation);
                 } else if let Some(m) = self.mobs.iter_mut().find(|m| m.id == p.id as u32) {
-                    m.swing();
+                    m.swing_hand_modified(hand == Hand::Off, animation.duration);
                 }
             }
             // The player's own instances: its maximum health (the hearts the
@@ -3928,6 +3939,34 @@ impl Game<'_> {
             }
         }
         let game_time = self.world.game_time;
+        // `AbstractPiglin.isConverting`: the dimension is not piglin safe.
+        let nether = self.dim == super::Dim::Nether;
+        // What a wither's side heads can look at, by network entity id: the
+        // mobs and the player (position and eye height).
+        let wither_targets: Vec<(i32, [f64; 3], f64)> = if self
+            .mobs
+            .iter()
+            .any(|m| m.species() == horizon_client::mobs::Species::Wither)
+        {
+            let own = self
+                .remote
+                .as_ref()
+                .zip(self.eye_position())
+                .map(|(r, eye)| (r.entity_id, eye, eye[1]));
+            self.mobs
+                .iter()
+                .map(|m| {
+                    (
+                        m.id as i32,
+                        [m.position.x, m.position.y, m.position.z],
+                        m.eye_y(),
+                    )
+                })
+                .chain(own)
+                .collect()
+        } else {
+            Vec::new()
+        };
         let Some(r) = self.remote.as_mut() else {
             return;
         };
@@ -4014,6 +4053,11 @@ impl Game<'_> {
             if m.species() == horizon_client::mobs::Species::Fox {
                 horizon_client::mobs::fox::client_tick(m);
             }
+            // Cat.tick: the lying and relaxing amounts follow the synched flags.
+            if m.species() == horizon_client::mobs::Species::Cat {
+                m.anim.vo = m.anim.v;
+                horizon_client::mobs::tame::cat_amounts(m);
+            }
             // Chicken.aiStep: the wings follow the server's on-ground flag.
             if m.species() == horizon_client::mobs::Species::Chicken {
                 horizon_client::mobs::farm::chicken_flap(m);
@@ -4021,6 +4065,20 @@ impl Game<'_> {
             // LivingEntity.updatingUsingItem: the ticks the item has been
             // used before this one. Another player's use particles; a mob's
             // drawn bow only needs the count (its pull follows it).
+            if player {
+                // AvatarRenderer.getArmPose: the used item's BLOCK animation
+                // (an item with `blocks_attacks`) raises the arm.
+                let used = if m.extra.using_off_hand {
+                    &m.extra.off_hand
+                } else {
+                    &m.extra.main_hand
+                };
+                m.extra.blocking = m.extra.using_item > 0
+                    && used
+                        .as_ref()
+                        .and_then(|i| self.res.items().get(i))
+                        .is_some_and(|i| i.blocks_attacks.is_some());
+            }
             if m.extra.using_item > 0 {
                 if player {
                     let item = if m.extra.using_off_hand {
@@ -4067,8 +4125,26 @@ impl Game<'_> {
             }
             // The animation states a server computes in its own `ai_step`.
             horizon_client::mobs::sync::client_tick(m, game_time);
-            if m.species() == horizon_client::mobs::Species::Panda {
-                horizon_client::mobs::panda::client_tick(m, thundering);
+            match m.species() {
+                // WitherBoss.aiStep: the side heads turn toward their targets.
+                horizon_client::mobs::Species::Wither => {
+                    horizon_client::mobs::wither::client_tick(m, |id| {
+                        wither_targets
+                            .iter()
+                            .find(|t| t.0 == id)
+                            .map(|t| (t.1, t.2))
+                    });
+                }
+                // Hoglin and piglin `isConverting` outside the Nether.
+                horizon_client::mobs::Species::Hoglin
+                | horizon_client::mobs::Species::Piglin
+                | horizon_client::mobs::Species::PiglinBrute => {
+                    horizon_client::mobs::piglin::client_converting(m, nether);
+                }
+                horizon_client::mobs::Species::Panda => {
+                    horizon_client::mobs::panda::client_tick(m, thundering);
+                }
+                _ => {}
             }
         }
         for o in self.orbs.iter_mut().filter(|_| running) {
@@ -4541,6 +4617,11 @@ impl Game<'_> {
             if reacts {
                 self.predict_use(&changes, seq);
                 self.open_command_block_if_editable((hit.pos[0], hit.pos[1], hit.pos[2]));
+            } else if self.predict_campfire_douse(hit.pos, held.as_ref(), seq) {
+                // CampfireBlock.useItemOn succeeded: this hand swings and the
+                // click ends, so a shield in the other hand is not raised.
+                self.with_hand(hand, Game::swing_arm);
+                return true;
             } else if held.as_ref().is_some_and(|s| &*s.item == "minecraft:brush") {
                 // BrushItem.useOn: brushing starts here (CONSUME, no swing); the
                 // server brushes and the dust is this client's own.
@@ -4727,7 +4808,7 @@ impl Game<'_> {
     /// predicted under the use's sequence until the server acknowledges it
     /// (`BlockStatePredictionHandler.retainKnownServerState`): a use the
     /// server refused goes back.
-    fn predict_blocks(&mut self, changes: &DryChanges, seq: i32) {
+    pub(super) fn predict_blocks(&mut self, changes: &DryChanges, seq: i32) {
         for &(p, state) in changes {
             let pos = [p.x, p.y, p.z];
             let before = self.world.block(p.x, p.y, p.z);
@@ -5115,6 +5196,28 @@ impl Game<'_> {
         if self.spectator() {
             return true;
         }
+        // A spear jabs (`MultiPlayerGameMode.piercingAttack`): the server
+        // stabs, this client swings, plays the sound and starts its charge
+        // again.
+        if let Some(kinetic) = self
+            .held()
+            .and_then(|s| horizon_client::spear::Kinetic::of(&s.item))
+        {
+            if self.cannot_attack_with_item(self.hand_strength.ticker, 0) {
+                return false;
+            }
+            // ServerboundPlayerActionPacket.Action.STAB.
+            self.send(S::PlayerAction(play::PlayerAction {
+                action: 8,
+                pos: [0; 3],
+                direction: 0,
+                sequence: 0,
+            }));
+            self.hand_strength.reset_attack();
+            self.swing_hand(Hand::Main, kinetic.attack_animation());
+            self.play_at_feet(kinetic.attack_sound);
+            return true;
+        }
         let mut instant = false;
         // A ghast's fireball or a wind charge nearer than any mob: the
         // server turns it (game/deflect.rs).
@@ -5165,7 +5268,13 @@ impl Game<'_> {
         if !down {
             self.clicks.miss_time = 0;
         }
-        if self.clicks.miss_time > 0 || self.using.is_some() {
+        // A piercing weapon neither breaks blocks nor swings on its own.
+        if self.clicks.miss_time > 0
+            || self.using.is_some()
+            || self
+                .held()
+                .is_some_and(|s| horizon_client::spear::Kinetic::of(&s.item).is_some())
+        {
             return;
         }
         let entity = self.entity_targeted();
diff --git a/crates/horizon-client/src/game/remote_mob_data.rs b/crates/horizon-client/src/game/remote_mob_data.rs
index a4080ac16..1e3f8887c 100644
--- a/crates/horizon-client/src/game/remote_mob_data.rs
+++ b/crates/horizon-client/src/game/remote_mob_data.rs
@@ -5,11 +5,13 @@
 use super::Game;
 use horizon_client::mobs::render::{PROFESSIONS, VILLAGER_TYPES};
 use horizon_client::mobs::{
-    Mob, Species, Who, armadillo, bat, bee, camel, creaking, finalize, panda, sniffer, sync, tame,
+    Mob, Species, Who, armadillo, bat, bee, camel, creaking, equine, finalize, illusioner, panda,
+    sniffer, sync, tame, zombie_villager,
 };
 use horizon_client::particles::{ParticleOptions, ParticleType};
 use horizon_protocol::entity_data::{Particle, ParticleData, Value};
 use horizon_protocol::registry::{Builtin, Dynamic};
+use horizon_world::registry::BlockStateId;
 
 /// The values `apply` takes from one SetEntityData packet, by vanilla's entry
 /// indices (Entity 0..=7, LivingEntity 8..=14, Mob 15, then the subclasses).
@@ -31,7 +33,21 @@ fn apply(m: &mut Mob, values: &[(u8, i32, Value)], builtin: &Builtin, local_enti
             // Entity.DATA_SHARED_FLAGS_ID's FLAG_ONFIRE: Entity.isOnFire on a
             // client, which draws the flames. A client doesn't count the
             // fire down: the flag goes off when the server's fire is out.
-            (0, Value::Byte(flags)) => m.fire_ticks = i32::from(flags & 1),
+            (0, Value::Byte(flags)) => {
+                m.fire_ticks = i32::from(flags & 1);
+                // Drowned.setSwimming: the shared flag of swimming.
+                if species == Species::Drowned {
+                    m.extra.flag = flags & 16 != 0;
+                }
+                // The shared flag of invisibility: Entity.isInvisible hides
+                // the model (an illusioner shows its mirror images).
+                let invisible = flags & 32 != 0;
+                if species == Species::Illusioner {
+                    illusioner::set_invisible(m, invisible);
+                } else if &*m.kind.id != "minecraft:player" {
+                    m.invisible = invisible;
+                }
+            }
             // Entity.DATA_POSE: the pose the species animates by.
             (6, Value::Id(pose)) => sync::set_pose(m, (*pose).clamp(0, 17) as u8),
             // LivingEntity.DATA_LIVING_ENTITY_FLAGS: using an item 1, in the
@@ -112,6 +128,9 @@ fn apply(m: &mut Mob, values: &[(u8, i32, Value)], builtin: &Builtin, local_enti
                 m.extra.sitting = flags & 1 != 0;
                 m.extra.tame = flags & 4 != 0;
             }
+            // Cat.IS_LYING and RELAX_STATE_ONE.
+            (Species::Cat, 21, Value::Bool(lying)) => m.extra.flag = *lying,
+            (Species::Cat, 22, Value::Bool(relaxing)) => m.extra.relax_one = *relaxing,
             // Wolf.DATA_COLLAR_COLOR and Cat's.
             (Species::Wolf, 21, Value::Int(c)) | (Species::Cat, 23, Value::Int(c)) => {
                 m.extra.color = (*c & 15) as u8;
@@ -215,6 +234,42 @@ fn apply(m: &mut Mob, values: &[(u8, i32, Value)], builtin: &Builtin, local_enti
             (Species::CopperGolem, 16, Value::Id(state)) => {
                 m.extra.variant = (*state).clamp(0, 3) as u8;
             }
+            // AbstractHorse.DATA_ID_FLAGS: eating 16 and standing 32 (the
+            // graze and the rear), which `sync::client_tick` animates.
+            (s, 18, Value::Byte(flags)) if equine::grazes(s) => equine::set_flags(m, *flags as u8),
+            // Enderman.DATA_CARRY_STATE (0 for none): the block it holds.
+            (Species::Enderman, 16, Value::Id(state)) => {
+                m.extra.carried = (*state > 0).then_some(BlockStateId(*state as u32));
+            }
+            // Zombie.DATA_DROWNED_CONVERSION_ID (after DATA_BABY_ID and
+            // DATA_SPECIAL_TYPE_ID): the conversion's shaking.
+            (Species::Zombie | Species::Husk, 18, Value::Bool(converting)) => {
+                m.extra.counter2 = i32::from(*converting);
+            }
+            // ZombieVillager.DATA_CONVERTING_ID (before its villager data).
+            (Species::ZombieVillager, 19, Value::Bool(converting)) => {
+                zombie_villager::set_converting(m, *converting);
+            }
+            // AbstractVillager.DATA_UNHAPPY_COUNTER (after AgeableMob's two):
+            // the head shake of `no`, which the server counts down.
+            (Species::Villager | Species::WanderingTrader, 18, Value::Int(ticks)) => {
+                m.extra.ints[0] = *ticks;
+            }
+            // Hoglin.DATA_IMMUNE_TO_ZOMBIFICATION (after AgeableMob's two) and
+            // AbstractPiglin's: `sync`'s conversion shake reads it.
+            (Species::Hoglin, 18, Value::Bool(immune))
+            | (Species::Piglin | Species::PiglinBrute, 16, Value::Bool(immune)) => {
+                m.extra.flag2 = *immune;
+            }
+            // Blaze.DATA_FLAGS_ID: charged 1, which makes it burn.
+            (Species::Blaze, 16, Value::Byte(flags)) => m.extra.flag = flags & 1 != 0,
+            // Turtle.HAS_EGG and LAYING_EGG (after AgeableMob's two).
+            (Species::Turtle, 18, Value::Bool(has_egg)) => m.extra.flag = *has_egg,
+            (Species::Turtle, 19, Value::Bool(laying)) => m.extra.flag2 = *laying,
+            // WitherBoss.DATA_TARGET_B and _C (after DATA_TARGET_A): the
+            // entities the side heads turn toward in `wither::client_tick`.
+            (Species::Wither, 17, Value::Int(id)) => m.extra.ints[0] = *id,
+            (Species::Wither, 18, Value::Int(id)) => m.extra.ints[1] = *id,
             // Pillager.IS_CHARGING_CROSSBOW: the charge pose (Raider's
             // IS_CELEBRATING takes 16).
             (Species::Pillager, 17, Value::Bool(charging)) => m.extra.flag = *charging,
@@ -357,9 +412,20 @@ impl Game<'_> {
         let Some(r) = &self.remote else {
             return;
         };
+        // LivingEntity.onSyncedDataUpdated(SLEEPING_POS_ID): a villager lies
+        // in its bed the way the bed faces, or gets up.
+        let bed = values.iter().find_map(|v| match v {
+            (14, _, Value::OptPos(bed)) => Some(bed.map_or(0, |b| self.bed_facing(b))),
+            _ => None,
+        });
         if let Some(m) = self.mobs.iter_mut().find(|m| m.id == id as u32) {
             apply(m, values, &r.builtin, r.entity_id);
             apply_registry_data(m, values, &r.registries, self.world.game_time);
+            if let Some(code) = bed
+                && m.species() == Species::Villager
+            {
+                m.extra.ints[1] = code;
+            }
         }
     }
 }
diff --git a/crates/horizon-client/src/game/spear.rs b/crates/horizon-client/src/game/spear.rs
index 13df3aed9..f7d1b5e4e 100644
--- a/crates/horizon-client/src/game/spear.rs
+++ b/crates/horizon-client/src/game/spear.rs
@@ -5,10 +5,13 @@
 //! attacker's own speed, and each condition runs out after its time
 //! (`Item.use`, `ItemStack.onUseTick`, `KineticWeapon.damageEntities`,
 //! `Player.stabAttack`). The hit's feedback (`onKineticHit`) reaches the
-//! players around as entity event 2.
+//! players around as entity event 2. A left click jabs instead
+//! (`PiercingWeapon.attack`), which Lunge turns into a dash.
 use super::{Game, view_vector};
 use horizon_client::{
+    attack_strength::delay,
     collisions::SceneCollisions,
+    first_person::Hand,
     items::ItemStack,
     mobs::Damage,
     spear::{HIT_FEEDBACK_TICKS, Kinetic, REACH},
@@ -115,6 +118,28 @@ impl Game<'_> {
         hits
     }
 
+    /// `ProjectileUtil.getHitEntitiesAlong` with the spear's `AttackRange`: the
+    /// mobs along the view from the minimum reach to the maximum plus the
+    /// attacker's own movement, none when a block is closer than the minimum.
+    fn stab_targets(&self, eye: Vec3, look: Vec3, movement: Vec3) -> Vec<usize> {
+        // AttackRange.effectiveMinRange and effectiveMaxRange for a player.
+        let (min, max) = if self.creative {
+            (REACH.min_creative, REACH.max_creative)
+        } else {
+            (REACH.min, REACH.max)
+        };
+        let from = eye.add_vector(look.scale(f64::from(min)));
+        let mut to = eye.add_vector(look.scale(f64::from(max) + movement.dot(look).max(0.0)));
+        // A block closer than the minimum reach takes the whole stab.
+        if let Some(block) = self.clip_collider(eye, to) {
+            to = block;
+            if eye.distance_squared(to) < eye.distance_squared(from) {
+                return Vec::new();
+            }
+        }
+        self.mobs_along(from, to, f64::from(REACH.hitbox_margin))
+    }
+
     /// `KineticWeapon.damageEntities`: one tick of the spear in use, `ticks`
     /// ticks into the use.
     pub(super) fn spear_tick(&mut self, stack: &ItemStack, ticks: u32) {
@@ -136,25 +161,10 @@ impl Game<'_> {
         let look = Vec3::new(look[0], look[1], look[2]);
         let movement = self.known_player_movement();
         let attacker_speed = look.dot(movement.scale(20.0));
-        // AttackRange.effectiveMinRange and effectiveMaxRange for a player.
-        let (min, max) = if self.creative {
-            (REACH.min_creative, REACH.max_creative)
-        } else {
-            (REACH.min, REACH.max)
-        };
-        let from = eye.add_vector(look.scale(f64::from(min)));
-        let mut to = eye.add_vector(look.scale(f64::from(max) + movement.dot(look).max(0.0)));
-        // A block closer than the minimum reach takes the whole stab.
-        if let Some(block) = self.clip_collider(eye, to) {
-            to = block;
-            if eye.distance_squared(to) < eye.distance_squared(from) {
-                return;
-            }
-        }
         let now = self.world.game_time;
         let actor = self.lan_acting;
         let mut affected = false;
-        for i in self.mobs_along(from, to, f64::from(REACH.hitbox_margin)) {
+        for i in self.stab_targets(eye, look, movement) {
             let key = (actor, self.mobs[i].id);
             let recent = self
                 .stabbed
@@ -204,9 +214,18 @@ impl Game<'_> {
             return false;
         };
         let from = [p.position.x, p.position.y, p.position.z];
-        // The enchantments' share, with no attack strength scaling for a
-        // weapon in use.
+        // The enchantments' share, scaled by the attack strength unless the
+        // weapon is in use.
         let magic_boost = self.enchant_damage_bonus(&kind);
+        let (base_damage, magic_boost) = if self.using.is_none() {
+            let scale = self.attack_strength_scale();
+            (
+                base_damage * (0.2 + scale * scale * 0.8),
+                magic_boost * scale,
+            )
+        } else {
+            (base_damage, magic_boost)
+        };
         let total = if deals_damage {
             base_damage + magic_boost
         } else {
@@ -275,6 +294,57 @@ impl Game<'_> {
         true
     }
 
+    /// `Player.cannotAttackWithItem` for the held item: a spear needs its
+    /// `minimum_attack_charge` of 1, counting `tolerance` ticks more than the
+    /// `ticker` ticks charged.
+    pub(super) fn cannot_attack_with_item(&self, ticker: i32, tolerance: i32) -> bool {
+        self.held().is_some_and(|s| Kinetic::of(&s.item).is_some())
+            && (ticker + tolerance) as f32 / delay(self.main_hand_attack_speed()) < 1.0
+    }
+
+    /// `PiercingWeapon.attack` of the spear in the main hand, for a left
+    /// click: every mob along the view is stabbed, then `postPiercingAttack`
+    /// (Lunge), the hit sound and the swing. Gives the sound of the jab
+    /// (`makeSound`), which everyone but the user hears from the server.
+    pub(super) fn jab(&mut self) -> Option<&'static str> {
+        let kinetic = self.held().and_then(|s| Kinetic::of(&s.item))?;
+        let eye = self.eye_position()?;
+        let eye = Vec3::new(eye[0], eye[1], eye[2]);
+        let look = view_vector(self.yaw, self.pitch);
+        let look = Vec3::new(look[0], look[1], look[2]);
+        // The attack damage attribute.
+        let damage = 1.0
+            + self.attack_item_info().map_or(0.0, |i| i.attack_damage)
+            + self.effect_attack_bonus();
+        let movement = self.known_player_movement();
+        let mut hit = false;
+        for i in self.stab_targets(eye, look, movement) {
+            hit |= self.stab_mob(i, damage, true, true, false);
+        }
+        // Player.onAttack, then postPiercingAttack.
+        self.attack_ticks = 0;
+        self.post_piercing_attack();
+        if hit {
+            self.play_at_feet(kinetic.hit_sound);
+        }
+        // swingAndResetAttackStrength (ServerPlayer): a swing that starts
+        // resets the attack strength.
+        let swings = self.swings_started;
+        self.swing_hand(Hand::Main, kinetic.attack_animation());
+        if self.swings_started != swings {
+            self.reset_attack_strength();
+        }
+        Some(kinetic.attack_sound)
+    }
+
+    /// A sound at the player's feet.
+    pub(super) fn play_at_feet(&mut self, sound: &str) {
+        if let Some(p) = &self.player {
+            let at = [p.position.x, p.position.y, p.position.z];
+            self.audio.play(sound, Some(at), 1.0, 1.0);
+        }
+    }
+
     /// `LivingEntity.onKineticHit` for `entity`: the hit feels (the spear
     /// moves back, `kinetic_hit_ticks`) and sounds, at most once every ten
     /// ticks.
diff --git a/crates/horizon-client/src/lib.rs b/crates/horizon-client/src/lib.rs
index 5ff582455..9f3af3541 100644
--- a/crates/horizon-client/src/lib.rs
+++ b/crates/horizon-client/src/lib.rs
@@ -22,12 +22,10 @@ pub mod block_entity_anim;
 pub mod block_entity_item;
 pub mod block_entity_render;
 pub mod block_transform;
-pub mod blocks;
 pub mod border_render;
 pub mod boss_overlay;
 pub mod breaking;
 pub mod brewing;
-pub mod bundle;
 pub mod camera;
 pub mod cauldron;
 pub mod chat;
@@ -43,7 +41,6 @@ pub mod confirm_screen;
 pub mod container_screen;
 pub mod containers;
 pub mod control;
-pub mod cooldowns;
 pub mod crafting;
 pub mod crash;
 pub mod creative;
@@ -58,7 +55,6 @@ pub mod dialog_screen;
 pub mod discord_presence;
 pub mod dynamic_light;
 pub mod effects;
-pub mod enchant;
 pub mod end_crystal;
 pub mod entities;
 pub mod entity_culling;
@@ -94,11 +90,9 @@ pub mod input;
 pub mod interaction_input;
 pub mod inv_sort;
 pub mod inventory_effects;
-pub mod item_data;
 pub mod item_render;
 pub mod item_sync;
 pub mod item_tooltip;
-pub mod items;
 pub mod java_text;
 pub mod key_names;
 pub mod keybinds;
@@ -148,7 +142,6 @@ pub mod pose;
 pub mod pregen;
 pub mod projectiles;
 pub mod raid;
-pub mod random_sequences;
 pub mod random_tick_sections;
 pub mod recipe_book;
 pub mod recipe_book_screen;
@@ -210,3 +203,10 @@ pub use horizon_client_core::scoreboard;
 pub use horizon_client_core::snbt;
 pub use horizon_client_core::text;
 pub use horizon_command as command;
+pub use horizon_items::blocks;
+pub use horizon_items::bundle;
+pub use horizon_items::cooldowns;
+pub use horizon_items::enchant;
+pub use horizon_items::item_data;
+pub use horizon_items::items;
+pub use horizon_items::random_sequences;
diff --git a/crates/horizon-client/src/mobs.rs b/crates/horizon-client/src/mobs.rs
index 29e9313f1..72c2a3d89 100644
--- a/crates/horizon-client/src/mobs.rs
+++ b/crates/horizon-client/src/mobs.rs
@@ -706,6 +706,8 @@ pub struct Extra {
     pub body_damage: i32,
     /// The components (dye, name...) of that armor stack.
     pub body_extra: Option<Box<crate::item_data::StackData>>,
+    /// `Cat.RELAX_STATE_ONE`: watching a sleeping owner before lying down.
+    pub relax_one: bool,
     /// The saddle's components (name, enchantments...) when it is not a bare
     /// one; `saddled` stays the gameplay flag.
     pub saddle_stack: Option<crate::items::ItemStack>,
@@ -963,7 +965,8 @@ pub enum MobEvent {
         mob: u32,
         at: [f64; 3],
     },
-    /// `Level.broadcastEntityEvent` for a mob: guests run `sync::entity_event`.
+    /// `Level.broadcastEntityEvent` for a mob: guests run its
+    /// `handleEntityEvent`.
     EntityEvent {
         mob: u32,
         event: i8,
@@ -1155,6 +1158,11 @@ pub enum MobEvent {
         count: u32,
         at: [f64; 3],
     },
+    /// `Mob.dropFromGiftLootTable`: a gift loot table's items dropped at `at`.
+    DropGift {
+        table: &'static str,
+        at: [f64; 3],
+    },
     SetBlock {
         pos: [i32; 3],
         state: horizon_world::registry::BlockStateId,
@@ -1483,6 +1491,8 @@ pub struct Seen {
     pub sitting: bool,
     /// `Entity.isSilent`.
     pub silent: bool,
+    /// `Cat.isLying` or `isRelaxStateOne`.
+    pub lying: bool,
     /// `Entity.isVehicle` or `isPassenger`.
     pub ridden: bool,
     /// `Attributes.KNOCKBACK_RESISTANCE`.
@@ -1578,6 +1588,7 @@ impl Mob {
             ],
             sitting: m.extra.sitting,
             silent: m.silent,
+            lying: m.species() == Species::Cat && (m.extra.flag || m.extra.relax_one),
             ridden: m.rider.is_some() || m.extra.rider.is_some() || m.extra.mount.is_some(),
             knockback_resistance: m.attrs.knockback_resistance,
             effects: m
@@ -1748,6 +1759,10 @@ pub struct PlayerView {
     /// A LAN guest: its own client moves it, and touching mobs push it there
     /// (`EntitySelector.pushableBy` on the client).
     pub remote: bool,
+    /// `isSleeping` and `getSleepTimer` (100 once slept through, then the
+    /// ticks fading out after waking up).
+    pub sleeping: bool,
+    pub sleep_timer: u32,
     /// `isPassenger`.
     pub passenger: bool,
 }
diff --git a/crates/horizon-client/src/mobs/ai.rs b/crates/horizon-client/src/mobs/ai.rs
index 7d596f5ca..eaadf14a4 100644
--- a/crates/horizon-client/src/mobs/ai.rs
+++ b/crates/horizon-client/src/mobs/ai.rs
@@ -53,17 +53,62 @@ pub struct Ai {
     /// Swing animation progress (attackAnim) and ticks.
     pub swing_time: i32,
     pub swinging: bool,
+    /// The current swing's `SwingDescription.durationTicks`; 0 is the default 6.
+    pub swing_duration: i32,
     /// Walked distance and the next footstep.
     pub steps: super::living::Steps,
 }
 impl Mob {
+    /// `LivingEntity.getCurrentSwingDuration`: 6 ticks unless a swing set its own.
+    pub fn swing_duration(&self) -> i32 {
+        if self.ai.swing_duration > 0 {
+            self.ai.swing_duration
+        } else {
+            6
+        }
+    }
+    /// `SwingState.startIfAble`: a swing past the first half of the current
+    /// one restarts it.
+    fn start_swing(&mut self, duration: i32) -> bool {
+        let half = self.swing_duration() / 2;
+        if self.ai.swinging && self.ai.swing_time >= 0 && self.ai.swing_time < half {
+            return false;
+        }
+        self.ai.swing_time = -1;
+        self.ai.swinging = true;
+        self.ai.swing_duration = duration.max(1);
+        true
+    }
     /// LivingEntity.swing
     pub fn swing(&mut self) {
-        if !self.ai.swinging || self.ai.swing_time >= 3 || self.ai.swing_time < 0 {
-            self.ai.swing_time = -1;
-            self.ai.swinging = true;
+        if self.start_swing(6) {
+            self.extra.swing_right_arm = None;
         }
     }
+    /// `LivingEntity.swing(hand, animation, false)` for a swing of `duration`
+    /// ticks (`getModifiedSwingDuration`): the arm is `hand.asArm(mainArm)`.
+    pub fn swing_hand(&mut self, off_hand: bool, duration: i32) {
+        if self.start_swing(duration) {
+            self.extra.swing_right_arm = Some(!off_hand != self.main_arm_left());
+        }
+    }
+    /// `swing_hand` for a swing of `base` ticks, lengthened or shortened by
+    /// this mob's haste, conduit power or mining fatigue
+    /// (`LivingEntity.getModifiedSwingDuration`).
+    pub fn swing_hand_modified(&mut self, off_hand: bool, base: i32) {
+        let amplifier = |id: &str| self.extra.effects.iter().find(|e| e.0 == id).map(|e| e.2);
+        let dig_speed = amplifier("minecraft:haste").max(amplifier("minecraft:conduit_power"));
+        let fatigue = amplifier("minecraft:mining_fatigue");
+        let duration = crate::first_person::swing_duration(
+            crate::first_person::SwingAnimation {
+                kind: 1,
+                duration: base,
+            },
+            dig_speed,
+            fatigue,
+        );
+        self.swing_hand(off_hand, duration);
+    }
 }
 /// The module implementing a species' behaviour.
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
@@ -540,18 +585,21 @@ fn effects_from_blocks(m: &mut Mob, w: &MobWorld) {
         }
     }
 }
-/// LivingEntity.updateSwingTime (6-tick swing duration).
+/// LivingEntity.updateSwingTime.
 pub fn tick_swing(m: &mut Mob) {
+    let duration = m.swing_duration();
     if m.ai.swinging {
         m.ai.swing_time += 1;
-        if m.ai.swing_time >= 6 {
+        if m.ai.swing_time >= duration {
             m.ai.swing_time = 0;
             m.ai.swinging = false;
+            m.ai.swing_duration = 0;
+            m.extra.swing_right_arm = None;
         }
     } else {
         m.ai.swing_time = 0;
     }
-    m.anim.attack_anim = m.ai.swing_time as f32 / 6.0;
+    m.anim.attack_anim = m.ai.swing_time as f32 / duration as f32;
 }
 /// `Entity.isInRain`: rain at the block position, or at the top of the box.
 pub(super) fn in_rain(m: &Mob, w: &MobWorld) -> bool {
@@ -587,6 +635,9 @@ fn axolotl_air_supply(m: &mut Mob, w: &MobWorld) {
 fn base_tick(m: &mut Mob, w: &MobWorld, events: &mut Vec<MobEvent>) {
     m.was_eye_in_water = m.fluids.eye_in_water;
     m.update_fluids(w, events);
+    if m.species() == Species::Drowned {
+        super::undead::drowned_update_swimming(m, w);
+    }
     let fire = crate::motion::environment::fire_contact(w.world, w.registry, m.bounds());
     if fire > 0.0 {
         m.ticks_frozen = 0;
diff --git a/crates/horizon-client/src/mobs/anim.rs b/crates/horizon-client/src/mobs/anim.rs
index 2eccd31f0..872944ac6 100644
--- a/crates/horizon-client/src/mobs/anim.rs
+++ b/crates/horizon-client/src/mobs/anim.rs
@@ -540,6 +540,26 @@ fn rot_lerp_rad(a: f32, from: f32, to: f32) -> f32 {
     }
     from + a * diff
 }
+/// `DrownedModel.setupSwimAnimation`: the arms reach up and sway, the legs
+/// kick and the head lies straight.
+fn drowned_swim(p: &mut Poses, s: &State, amount: f32) {
+    if amount <= 0.0 {
+        return;
+    }
+    let sway = amount * 0.35 * (0.1 * s.age).msin();
+    let kick = amount * 0.55 * (0.1 * s.age).msin();
+    let reach = -PI * 4.0 / 5.0;
+    let (right_x, left_x) = (p.get("right_arm")[3], p.get("left_arm")[3]);
+    let (right_z, left_z) = (p.get("right_arm")[5], p.get("left_arm")[5]);
+    p.xrot("right_arm", rot_lerp_rad(amount, right_x, reach) + sway);
+    p.xrot("left_arm", rot_lerp_rad(amount, left_x, reach) - sway);
+    p.zrot("right_arm", rot_lerp_rad(amount, right_z, -0.15));
+    p.zrot("left_arm", rot_lerp_rad(amount, left_z, 0.15));
+    let (left_leg, right_leg) = (p.get("left_leg")[3], p.get("right_leg")[3]);
+    p.xrot("left_leg", left_leg - kick);
+    p.xrot("right_leg", right_leg + kick);
+    p.xrot("head", 0.0);
+}
 /// `HumanoidModel.setupSwimAnimation`: the stroke of both arms over 26
 /// walk-animation units, the head down and a slow flutter kick. The left arm
 /// eases the short way round, the right one linearly, as in vanilla.
@@ -697,6 +717,9 @@ pub fn setup(
             h.crouching = m.extra.crouching;
             h.passenger = m.extra.passenger;
             humanoid(p, s, &h);
+            if m.kind.anim == Anim::Drowned {
+                drowned_swim(p, s, m.extra.swim.amount(s.partial));
+            }
             if m.kind.anim == Anim::ZombifiedPiglin {
                 super::piglin::ears(p, s);
             }
diff --git a/crates/horizon-client/src/mobs/equine.rs b/crates/horizon-client/src/mobs/equine.rs
index 1155388fd..8b0463849 100644
--- a/crates/horizon-client/src/mobs/equine.rs
+++ b/crates/horizon-client/src/mobs/equine.rs
@@ -471,6 +471,11 @@ pub fn ai_step(m: &mut Mob, w: &MobWorld, events: &mut Vec<MobEvent>) {
     if m.extra.counter > 0 {
         m.extra.counter -= 1;
     }
+    animate(m);
+}
+/// `AbstractHorse.tick`'s eat, stand and mouth animations, which follow the
+/// eating and standing flags (`flag` and `counter > 0`).
+pub fn animate(m: &mut Mob) {
     let (eating, standing) = (m.extra.flag, m.extra.counter > 0);
     let v = &mut m.anim.v;
     if standing {
@@ -488,6 +493,22 @@ pub fn ai_step(m: &mut Mob, w: &MobWorld, events: &mut Vec<MobEvent>) {
     }
     v[MOUTH] = (v[MOUTH] - v[MOUTH] * 0.7 - 0.05).max(0.0);
 }
+/// `AbstractHorse.tick` on a client that is not the server: the animations
+/// follow the flags of the synched data (`set_flags`).
+pub fn client_tick(m: &mut Mob) {
+    m.anim.vo = m.anim.v;
+    animate(m);
+}
+/// `AbstractHorse.DATA_ID_FLAGS` on a client: eating 16 and standing 32.
+pub fn set_flags(m: &mut Mob, flags: u8) {
+    m.extra.flag = flags & 16 != 0;
+    m.extra.counter = i32::from(flags & 32 != 0);
+}
+/// Whether `ai_step` above runs this species' grazing and rearing, so that
+/// the server's flags 16 and 32 mean eating and standing.
+pub fn grazes(s: Species) -> bool {
+    is_equine(s) && !super::camel::is_camel(s) && !super::llama::is_llama(s)
+}
 /// Body texture and the markings overlay.
 pub fn texture(m: &Mob) -> String {
     let baby = if m.is_baby() { "_baby" } else { "" };
diff --git a/crates/horizon-client/src/mobs/guardian.rs b/crates/horizon-client/src/mobs/guardian.rs
index 4bdd1831b..f86fd0bc4 100644
--- a/crates/horizon-client/src/mobs/guardian.rs
+++ b/crates/horizon-client/src/mobs/guardian.rs
@@ -112,14 +112,14 @@ impl Goal for GuardianAttack {
         if self.attack_time == 0 {
             m.extra.flag = true;
             m.extra.counter2 = 0;
-            // Entity event 21: the attack sound loop starts.
-            let sound = "entity.guardian.attack";
-            cx.events.push(MobEvent::Sound(
-                sound,
-                [m.position.x, m.position.y, m.position.z],
-                1.0,
-                1.0,
-            ));
+            // Entity event 21: the attack sound loop starts on the clients.
+            if !m.silent {
+                cx.events.push(MobEvent::EntityEvent {
+                    mob: m.id,
+                    event: 21,
+                    at: [m.position.x, m.position.y, m.position.z],
+                });
+            }
         } else if self.attack_time >= attack_duration(m) {
             // Indirect magic (1, +2 on Hard, +2 for the elder), then
             // doHurtTarget.
@@ -476,3 +476,12 @@ pub fn anim(m: &Mob, s: &State, p: &mut Poses) {
     p.yrot("tail1", tail.msin() * PI * 0.1);
     p.yrot("tail2", tail.msin() * PI * 0.15);
 }
+/// `Guardian.getAttackAnimationScale(0)`: how far the beam has charged. A
+/// beam that ended counts from zero again.
+pub fn attack_scale(m: &Mob) -> f32 {
+    if m.extra.flag {
+        m.extra.counter2 as f32 / attack_duration(m) as f32
+    } else {
+        0.0
+    }
+}
diff --git a/crates/horizon-client/src/mobs/illusioner.rs b/crates/horizon-client/src/mobs/illusioner.rs
index b98e56920..3ef6b0592 100644
--- a/crates/horizon-client/src/mobs/illusioner.rs
+++ b/crates/horizon-client/src/mobs/illusioner.rs
@@ -146,6 +146,15 @@ impl Goal for Spell {
     }
 }
 
+/// `Entity.isInvisible` of an illusioner on a client: the shared flag stands
+/// in for the effect the server holds, which draws the mirror images.
+pub fn set_invisible(m: &mut Mob, on: bool) {
+    m.extra.effects.retain(|e| e.0 != INVISIBILITY);
+    if on {
+        m.extra.effects.push((INVISIBILITY, i32::MAX, 0));
+    }
+}
+
 /// The client-side half of `Illusioner.aiStep`: new image offsets when
 /// hurt and once a minute, with a puff of cloud and a sound.
 pub fn tick(m: &mut Mob, events: &mut Vec<MobEvent>) {
diff --git a/crates/horizon-client/src/mobs/living.rs b/crates/horizon-client/src/mobs/living.rs
index 2de7297ef..7e4058ec0 100644
--- a/crates/horizon-client/src/mobs/living.rs
+++ b/crates/horizon-client/src/mobs/living.rs
@@ -1118,17 +1118,24 @@ impl Mob {
                         self.ai.no_jump_delay = 10;
                     }
                 } else {
-                    self.jump_in_liquid();
+                    self.jump_in_liquid(true);
                 }
             } else {
-                self.jump_in_liquid();
+                self.jump_in_liquid(false);
             }
         } else {
             self.ai.no_jump_delay = 0;
         }
     }
     /// Mob.jumpInLiquid: floaters rise 0.04 per tick, others 0.3; bees 0.01.
-    fn jump_in_liquid(&mut self) {
+    /// A magma cube in lava rises to `0.22 + size * 0.05` instead
+    /// (`MagmaCube.jumpInLiquid`).
+    fn jump_in_liquid(&mut self, lava: bool) {
+        if lava && self.species() == super::Species::MagmaCube {
+            self.velocity.y = f64::from(0.22_f32 + self.extra.size as f32 * 0.05);
+            self.needs_sync = true;
+            return;
+        }
         self.velocity.y += if self.species() == super::Species::Bee {
             0.01
         } else if self.ai.nav.can_float {
diff --git a/crates/horizon-client/src/mobs/piglin.rs b/crates/horizon-client/src/mobs/piglin.rs
index ed219d312..aaaaf4dda 100644
--- a/crates/horizon-client/src/mobs/piglin.rs
+++ b/crates/horizon-client/src/mobs/piglin.rs
@@ -465,6 +465,13 @@ pub fn celebrate(m: &mut Mob, w: &MobWorld) {
         t.position.z.floor() as i32,
     ]);
 }
+/// `Hoglin.isConverting` and `AbstractPiglin.isConverting` on a client: in a
+/// dimension that is not piglin safe (`nether` is false), a mob that is not
+/// immune (`flag2`) and has AI shakes. `counter2 > 0` draws the shake, as it
+/// does on the server while the zombification counts up.
+pub fn client_converting(m: &mut Mob, nether: bool) {
+    m.extra.counter2 = i32::from(!nether && !m.extra.flag2 && !m.no_ai);
+}
 /// Per-tick piglin and hoglin state: admiring, anger, zombification and the
 /// hoglin attack animation. Returns a conversion when it happens.
 pub fn ai_step(m: &mut Mob, w: &MobWorld, events: &mut Vec<MobEvent>) {
diff --git a/crates/horizon-client/src/mobs/render.rs b/crates/horizon-client/src/mobs/render.rs
index d02c3a172..aa47b2a96 100644
--- a/crates/horizon-client/src/mobs/render.rs
+++ b/crates/horizon-client/src/mobs/render.rs
@@ -923,6 +923,17 @@ pub fn base_transform_at(m: &Mob, alpha: f32, origin: glam::Mat4) -> glam::Mat4
                 (sign * horizon_core::jmath::acos(dot.abs().min(1.0))) as f32,
             );
         }
+    } else if m.species() == Species::Drowned {
+        // DrownedRenderer.setupRotations: tip toward the look pitch about
+        // the middle of the box while swimming.
+        let amount = m.extra.swim.amount(alpha);
+        if amount > 0.0 {
+            let pitch = m.previous_head_pitch + (m.head_pitch - m.previous_head_pitch) * alpha;
+            let middle = glam::Vec3::new(0.0, m.height() / 2.0, 0.0);
+            base *= glam::Mat4::from_translation(middle)
+                * glam::Mat4::from_rotation_x((amount * (-10.0 - pitch)).to_radians())
+                * glam::Mat4::from_translation(-middle);
+        }
     } else if m.extra.swim.amount(alpha) > 0.0 {
         // AvatarRenderer.setupRotations: tip forward with the swim amount,
         // following the pitch in water, then lie along the swimming box.
diff --git a/crates/horizon-client/src/mobs/sync.rs b/crates/horizon-client/src/mobs/sync.rs
index 16cd2b30c..fd45ebbb8 100644
--- a/crates/horizon-client/src/mobs/sync.rs
+++ b/crates/horizon-client/src/mobs/sync.rs
@@ -16,12 +16,13 @@
 //! - run its client side animation in `client_tick`, sharing the function
 //!   with the server's `ai_step` where the server computes the same.
 use super::{
-    Mob, Species, allay, armadillo, axolotl, breeze, camel, copper_golem, creaking, frog, goat,
-    golem, guardian, piglin, ravager, shulker, sniffer, warden,
+    Mob, Species, allay, armadillo, axolotl, breeze, camel, copper_golem, creaking, equine, frog,
+    goat, golem, guardian, piglin, ravager, shulker, sniffer, undead, villager, warden,
 };
 
 // `Pose.id` of the poses mobs take.
 pub const STANDING: u8 = 0;
+pub const SLEEPING: u8 = 2;
 pub const LONG_JUMPING: u8 = 6;
 pub const CROAKING: u8 = 8;
 pub const USING_TONGUE: u8 = 9;
@@ -42,6 +43,8 @@ pub fn pose_id(m: &Mob) -> u8 {
         Species::Breeze => breeze::pose_id(m),
         Species::Camel | Species::CamelHusk if camel::sitting(m) => SITTING,
         Species::Frog => m.extra.pose,
+        // LivingEntity.startSleeping: the pose, with the bed in index 14.
+        Species::Villager if villager::sleeping(m) => SLEEPING,
         _ => STANDING,
     }
 }
@@ -87,6 +90,8 @@ pub fn client_tick(m: &mut Mob, game_time: i64) {
         Species::Armadillo => armadillo::tick(m),
         Species::Frog => frog::tick(m),
         Species::Goat => goat::tick(m),
+        s if equine::grazes(s) => equine::client_tick(m),
+        Species::Drowned => undead::drowned_client_tick(m),
         _ => {}
     }
 }
diff --git a/crates/horizon-client/src/mobs/tame.rs b/crates/horizon-client/src/mobs/tame.rs
index faee3c4de..53d15dba1 100644
--- a/crates/horizon-client/src/mobs/tame.rs
+++ b/crates/horizon-client/src/mobs/tame.rs
@@ -12,7 +12,7 @@ use super::{
 };
 use horizon_core::geometry::trig::Mth;
 use horizon_core::{
-    geometry::{Aabb, Vec3},
+    geometry::{Aabb, Axis, Vec3},
     random::RandomSource,
 };
 use std::f32::consts::PI;
@@ -768,6 +768,7 @@ pub fn register_cat(m: &mut Mob) {
     g.add(1, Float);
     g.add(1, TamePanic(Panic::new(1.5)));
     g.add(2, SitWhenOrdered);
+    g.add(3, CatRelaxOnOwner::default());
     g.add(4, CatTempt(super::goals::Tempt::new(0.6, food, true)));
     g.add(
         4,
@@ -848,6 +849,202 @@ fn empty_above(w: &MobWorld, p: [i32; 3]) -> bool {
         .as_ref()
         == "minecraft:air"
 }
+/// Whether `p` is the player that owns `m` (a cat without a recorded owner
+/// belongs to whoever it sees).
+pub fn is_owner_of(m: &Mob, p: &super::PlayerView) -> bool {
+    m.extra.owner.is_none_or(|o| o == p.uuid)
+}
+/// `Cat.CatRelaxOnOwnerGoal`: while the owner sleeps, the cat lies down beside
+/// them, and may leave a morning gift when they wake up.
+#[derive(Clone, Debug, Default)]
+struct CatRelaxOnOwner {
+    goal: Option<[i32; 3]>,
+    on_bed_ticks: i32,
+}
+impl CatRelaxOnOwner {
+    /// `spaceIsOccupied`: another cat lying or relaxing within two blocks.
+    fn occupied(&self, m: &Mob, w: &MobWorld) -> bool {
+        let Some(g) = self.goal else { return true };
+        let area = Aabb::new(
+            Vec3::new(
+                f64::from(g[0]) - 2.0,
+                f64::from(g[1]) - 2.0,
+                f64::from(g[2]) - 2.0,
+            ),
+            Vec3::new(
+                f64::from(g[0]) + 3.0,
+                f64::from(g[1]) + 3.0,
+                f64::from(g[2]) + 3.0,
+            ),
+        );
+        w.others.iter().any(|o| {
+            o.species == Species::Cat && o.id != m.id && o.lying && o.bounds.intersects(area)
+        })
+    }
+    /// The owner's sleeping state, when this cat may relax on them: the
+    /// player it sees has to be its owner (`Cat.getOwner`).
+    fn sleeping_owner<'w>(m: &Mob, w: &'w MobWorld) -> Option<&'w super::PlayerView> {
+        w.player
+            .as_ref()
+            .filter(|p| m.extra.tame && !m.extra.sitting && p.sleeping && is_owner_of(m, p))
+    }
+}
+impl Goal for CatRelaxOnOwner {
+    goal_clone!();
+    fn flags(&self) -> u8 {
+        0
+    }
+    fn can_use(&mut self, m: &mut Mob, cx: &mut Cx) -> bool {
+        let w = cx.w;
+        let Some(p) = Self::sleeping_owner(m, w) else {
+            return false;
+        };
+        if m.distance_sqr(p.position) > 100.0 {
+            return false;
+        }
+        let at = [
+            p.position.x.floor() as i32,
+            p.position.y.floor() as i32,
+            p.position.z.floor() as i32,
+        ];
+        if !has_tag(w, at, "minecraft:cats_can_lie_on") {
+            return false;
+        }
+        // The bed's foot: against `BedBlock.FACING`.
+        let back = match w.prop(at[0], at[1], at[2], "facing") {
+            Some("north") => [0, 0, 1],
+            Some("south") => [0, 0, -1],
+            Some("east") => [-1, 0, 0],
+            Some("west") => [1, 0, 0],
+            Some("up") => [0, -1, 0],
+            Some("down") => [0, 1, 0],
+            _ => [0, 0, 0],
+        };
+        self.goal = Some([at[0] + back[0], at[1] + back[1], at[2] + back[2]]);
+        !self.occupied(m, w)
+    }
+    fn can_continue(&mut self, m: &mut Mob, cx: &mut Cx) -> bool {
+        Self::sleeping_owner(m, cx.w).is_some() && self.goal.is_some() && !self.occupied(m, cx.w)
+    }
+    fn start(&mut self, m: &mut Mob, cx: &mut Cx) {
+        if let Some(g) = self.goal {
+            m.extra.flag2 = false;
+            m.nav_move_to(
+                cx.w,
+                [f64::from(g[0]), f64::from(g[1]), f64::from(g[2])],
+                1.1,
+            );
+        }
+    }
+    fn stop(&mut self, m: &mut Mob, cx: &mut Cx) {
+        m.extra.flag = false;
+        // The `gameplay/cat_waking_up_gift_chance` of the `day` timeline: 0.7
+        // from tick 23667 of the day to tick 362 of the next, 0 in between.
+        let day = cx.w.day_time.rem_euclid(24000);
+        let chance = if !cx.w.nether && !cx.w.end && !(362..23667).contains(&day) {
+            0.7
+        } else {
+            0.0
+        };
+        if cx
+            .w
+            .player
+            .as_ref()
+            .is_some_and(|p| is_owner_of(m, p) && p.sleep_timer >= 100)
+            && m.random.next_float() < chance
+        {
+            give_morning_gift(m, cx);
+        }
+        self.on_bed_ticks = 0;
+        m.extra.relax_one = false;
+        m.nav_stop();
+    }
+    fn tick(&mut self, m: &mut Mob, cx: &mut Cx) {
+        let (Some(p), Some(g)) = (cx.w.player.as_ref(), self.goal) else {
+            return;
+        };
+        m.extra.flag2 = false;
+        m.nav_move_to(
+            cx.w,
+            [f64::from(g[0]), f64::from(g[1]), f64::from(g[2])],
+            1.1,
+        );
+        if m.distance_sqr(p.position) < 2.5 {
+            self.on_bed_ticks += 1;
+            if self.on_bed_ticks > reduced(16) {
+                m.extra.flag = true;
+                m.extra.relax_one = false;
+            } else {
+                m.look_at_speed(p.eye, 45.0, 45.0);
+                m.extra.relax_one = true;
+            }
+        } else {
+            m.extra.flag = false;
+        }
+    }
+}
+/// `CatRelaxOnOwnerGoal.giveMorningGift`: hop to a spot within five blocks
+/// (`randomTeleport`, avoiding `#dangerous_for_teleportation`) and drop a
+/// `gameplay/cat_morning_gift` item at its feet.
+fn give_morning_gift(m: &mut Mob, cx: &mut Cx) {
+    let w = cx.w;
+    let at = [
+        m.position.x.floor() as i32,
+        m.position.y.floor() as i32,
+        m.position.z.floor() as i32,
+    ];
+    let x = at[0] + m.random.next_int_bound(11).unwrap_or(5) - 5;
+    let y = at[1] + m.random.next_int_bound(5).unwrap_or(2) - 2;
+    let z = at[2] + m.random.next_int_bound(11).unwrap_or(5) - 5;
+    let tagged = |p: [i32; 3], tag| has_tag(w, p, tag);
+    let mut ground = y - 1;
+    while ground > crate::chunk::MIN_Y
+        && !tagged([x, ground, z], "minecraft:entities_can_teleport_to")
+    {
+        ground -= 1;
+    }
+    if w.world.loaded(x, z) && ground > crate::chunk::MIN_Y {
+        let feet = f64::from(ground + 1);
+        let half = f64::from(m.width()) / 2.0;
+        let b = Aabb::new(
+            Vec3::new(f64::from(x) - half, feet, f64::from(z) - half),
+            Vec3::new(
+                f64::from(x) + half,
+                feet + f64::from(m.height()),
+                f64::from(z) + half,
+            ),
+        );
+        let dangerous = |p| tagged(p, "minecraft:dangerous_for_teleportation");
+        let in_box = |f: &dyn Fn([i32; 3]) -> bool| {
+            (b.min(Axis::X).floor() as i32..=b.max(Axis::X).floor() as i32).any(|bx| {
+                (b.min(Axis::Y).floor() as i32..=b.max(Axis::Y).floor() as i32).any(|by| {
+                    (b.min(Axis::Z).floor() as i32..=b.max(Axis::Z).floor() as i32)
+                        .any(|bz| f([bx, by, bz]))
+                })
+            })
+        };
+        let fluids = w.fluids(b, feet);
+        if !dangerous([x, ground, z])
+            && w.no_collision(b)
+            && !(fluids.in_water || fluids.in_lava)
+            && !in_box(&dangerous)
+        {
+            m.position = Vec3::new(f64::from(x), feet, f64::from(z));
+            m.previous = m.position;
+            m.velocity = Vec3::ZERO;
+        }
+    }
+    let yaw = m.body_yaw * (PI / 180.0);
+    let here = [
+        m.position.x.floor() - f64::from(yaw.msin()),
+        m.position.y.floor(),
+        m.position.z.floor() + f64::from(yaw.mcos()),
+    ];
+    cx.events.push(MobEvent::DropGift {
+        table: "minecraft:gameplay/cat_morning_gift",
+        at: here,
+    });
+}
 /// `CatLieOnBlockGoal`: tame cats lie on beds and other warm blocks.
 #[derive(Clone, Debug)]
 struct CatLieOnBlock(super::goals::MoveToBlock);
@@ -997,7 +1194,17 @@ impl Goal for OcelotAttack {
 }
 /// `Cat.tick`: lying and relaxing amounts and the purr.
 pub fn cat_ai_step(m: &mut Mob, events: &mut Vec<MobEvent>) {
+    cat_amounts(m);
+    if (m.extra.flag || m.extra.relax_one) && m.age.is_multiple_of(5) {
+        let volume = 0.6 + 0.4 * (m.random.next_float() - m.random.next_float());
+        events.push(MobEvent::Sound("entity.cat.purr", m.center(), volume, 1.0));
+    }
+}
+/// The lying and relaxing amounts of `Cat.tick` (also a client's, from the
+/// synched flags).
+pub fn cat_amounts(m: &mut Mob) {
     let lying = m.extra.flag;
+    let relaxing = m.extra.relax_one;
     let v = &mut m.anim.v;
     if lying {
         v[LIE] = (v[LIE] + 0.15).min(1.0);
@@ -1006,11 +1213,11 @@ pub fn cat_ai_step(m: &mut Mob, events: &mut Vec<MobEvent>) {
         v[LIE] = (v[LIE] - 0.22).max(0.0);
         v[LIE_TAIL] = (v[LIE_TAIL] - 0.13).max(0.0);
     }
-    v[RELAX] = (v[RELAX] - 0.13).max(0.0);
-    if lying && m.age.is_multiple_of(5) {
-        let volume = 0.6 + 0.4 * (m.random.next_float() - m.random.next_float());
-        events.push(MobEvent::Sound("entity.cat.purr", m.center(), volume, 1.0));
-    }
+    v[RELAX] = if relaxing {
+        (v[RELAX] + 0.1).min(1.0)
+    } else {
+        (v[RELAX] - 0.13).max(0.0)
+    };
 }
 /// `Cat.finalizeSpawn` variant: any but all-black, which a full moon allows.
 pub fn cat_variant(m: &mut Mob, w_moon_full: bool) -> u8 {
diff --git a/crates/horizon-client/src/mobs/undead.rs b/crates/horizon-client/src/mobs/undead.rs
index 0f446c87a..01e104001 100644
--- a/crates/horizon-client/src/mobs/undead.rs
+++ b/crates/horizon-client/src/mobs/undead.rs
@@ -181,6 +181,17 @@ fn drowned_ok_target(m: &Mob, w: &super::MobWorld) -> bool {
 pub fn drowned_wants_to_swim(m: &Mob, w: &super::MobWorld) -> bool {
     m.extra.flag2 || m.target_info(w).is_some_and(|t| in_water_at(w, t.position))
 }
+/// `Drowned.updateSwimming`: swimming under water while it wants to. `flag`
+/// holds `isSwimming`, which clients take from the entity's shared flags.
+pub fn drowned_update_swimming(m: &mut Mob, w: &super::MobWorld) {
+    m.extra.flag =
+        !m.no_ai && m.was_eye_in_water && m.fluids.in_water && drowned_wants_to_swim(m, w);
+}
+/// A drowned on a client: `LivingEntity.updateSwimAmount` follows the
+/// swimming flag (`Drowned.isVisuallySwimming`).
+pub fn drowned_client_tick(m: &mut Mob) {
+    m.extra.swim.tick(m.extra.flag, m.fluids.in_water);
+}
 /// Drowned.DrownedMoveControl
 pub fn drowned_move_control(m: &mut Mob, w: &super::MobWorld) {
     let target = m.target_info(w);
diff --git a/crates/horizon-client/src/mobs/wither.rs b/crates/horizon-client/src/mobs/wither.rs
index 0a429b135..d7fc5f093 100644
--- a/crates/horizon-client/src/mobs/wither.rs
+++ b/crates/horizon-client/src/mobs/wither.rs
@@ -170,9 +170,7 @@ fn target_pos(w: &MobWorld, id: i32) -> Option<([f64; 3], f64, bool)> {
     }
 }
 /// `WitherBoss.aiStep` on a client of a server: the smoke about each head
-/// (`radius` 0.3 of the wither's scale, which is 1 here). The heads' turning
-/// and the coloured particles need the server's targets and invulnerable
-/// ticks, which a client is not sent.
+/// (`radius` 0.3 of the wither's scale, which is 1 here).
 pub fn client_smoke(m: &mut Mob, events: &mut Vec<MobEvent>) {
     for i in 0..3 {
         let h = head_pos(m, i);
@@ -189,13 +187,12 @@ pub fn client_smoke(m: &mut Mob, events: &mut Vec<MobEvent>) {
         });
     }
 }
-/// `WitherBoss.aiStep` after `super.aiStep()`: the side heads turn, smoke
-/// rises from the heads (the particle offsets are drawn on the server too).
-pub fn ai_step(m: &mut Mob, w: &MobWorld, events: &mut Vec<MobEvent>) {
-    // Side heads turn toward their targets, else back to the body.
+/// The side heads turn toward their targets, else back to the body. `find`
+/// gives the position and eye height of the entity a head's target id names.
+fn turn_heads(m: &mut Mob, find: impl Fn(i32) -> Option<([f64; 3], f64)>) {
     for i in 0..2 {
-        match target_pos(w, m.extra.ints[i]) {
-            Some((p, eye, _)) => {
+        match find(m.extra.ints[i]) {
+            Some((p, eye)) => {
                 let h = head_pos(m, i + 1);
                 let (xd, yd, zd) = (p[0] - h[0], eye - h[1], p[2] - h[2]);
                 let sd = (xd * xd + zd * zd).sqrt();
@@ -207,6 +204,18 @@ pub fn ai_step(m: &mut Mob, w: &MobWorld, events: &mut Vec<MobEvent>) {
             None => m.anim.v[i] = rotlerp(m.anim.v[i], m.body_yaw, 10.0),
         }
     }
+}
+/// `WitherBoss.aiStep` on a client that is not the server: the side heads
+/// turn toward the targets of the synched data (`DATA_TARGET_B` and `_C`,
+/// kept in `ints[0]` and `ints[1]` as network entity ids).
+pub fn client_tick(m: &mut Mob, find: impl Fn(i32) -> Option<([f64; 3], f64)>) {
+    m.anim.vo = m.anim.v;
+    turn_heads(m, find);
+}
+/// `WitherBoss.aiStep` after `super.aiStep()`: the side heads turn, smoke
+/// rises from the heads (the particle offsets are drawn on the server too).
+pub fn ai_step(m: &mut Mob, w: &MobWorld, events: &mut Vec<MobEvent>) {
+    turn_heads(m, |id| target_pos(w, id).map(|(p, eye, _)| (p, eye)));
     let powered = powered(m);
     for i in 0..3 {
         let h = head_pos(m, i);
@@ -284,11 +293,20 @@ pub fn custom_server_ai_step(m: &mut Mob, w: &MobWorld, events: &mut Vec<MobEven
         let id = m.extra.ints[k];
         if id != 0 {
             match target_pos(w, id) {
+                // `hasLineOfSight` too: no volley through a wall.
                 Some((p, eye, _))
                     if (p[0] - m.position.x).powi(2)
                         + (p[1] - m.position.y).powi(2)
                         + (p[2] - m.position.z).powi(2)
-                        <= 900.0 =>
+                        <= 900.0
+                        && m.sees(
+                            w,
+                            if id == -1 {
+                                Who::Player
+                            } else {
+                                Who::Mob(id as u32)
+                            },
+                        ) =>
                 {
                     let at = [p[0], p[1] + (eye - p[1]) * 0.5, p[2]];
                     shoot(m, i + 1, at, false, events);
diff --git a/crates/horizon-client/src/mobs/zombie_villager.rs b/crates/horizon-client/src/mobs/zombie_villager.rs
index 51fb33c6d..c5fae726a 100644
--- a/crates/horizon-client/src/mobs/zombie_villager.rs
+++ b/crates/horizon-client/src/mobs/zombie_villager.rs
@@ -24,6 +24,14 @@ pub struct Cure {
 pub fn cure(m: &Mob) -> Option<&Cure> {
     villager::ext(m).and_then(|e| e.cure.as_ref())
 }
+/// `ZombieVillager.DATA_CONVERTING_ID` on a client: only `is_converting`
+/// (the cure's shaking) reads the cure, so its time does not matter.
+pub fn set_converting(m: &mut Mob, on: bool) {
+    villager::ext_mut(m).cure = on.then_some(Cure {
+        time: 0,
+        starter: None,
+    });
+}
 pub fn is_converting(m: &Mob) -> bool {
     m.species() == Species::ZombieVillager && cure(m).is_some()
 }
diff --git a/crates/horizon-client/src/mod_content.rs b/crates/horizon-client/src/mod_content.rs
index cb96fea06..2d8d2de3b 100644
--- a/crates/horizon-client/src/mod_content.rs
+++ b/crates/horizon-client/src/mod_content.rs
@@ -673,37 +673,14 @@ const NBT_TABLES: [&str; 6] = [
     "worldgen/blocks/cached-support.nbt",
     "worldgen/blocks/cached-collision.nbt",
 ];
-/// In a root built here: the namespaces the content mods own (their ids and
-/// listed namespaces), which loaders read besides `minecraft`.
-const MARKER: &str = "horizon-mod-content.json";
+use horizon_items::content_namespaces::MARKER;
+pub use horizon_items::content_namespaces::{namespaces, tag_namespaces};
 /// Block states a world can hold. Chunk sections widen their global palette
 /// past vanilla's 16 bits to fit the registry (crate::chunk::set_block_states);
 /// this caps it at 20 bits, about 29 times vanilla's 35,723 states. Mods past
 /// it are refused, not wrapped onto other blocks.
 pub const MAX_STATES: u32 = 1 << 20;
 
-/// The content mods' namespaces in a root built by [`build`]; none in any
-/// other root, so vanilla's loaders read exactly what they did.
-pub fn namespaces(root: &Path) -> Vec<String> {
-    fs::read(root.join(MARKER))
-        .ok()
-        .and_then(|b| serde_json::from_slice(&b).ok())
-        .unwrap_or_default()
-}
-
-/// The namespaces whose tags loaders read in `root`: `minecraft`, and in a
-/// root built by [`build`] the convention tags (`c`, shared between mods as
-/// on NeoForge and Fabric) and the content mods' own.
-pub fn tag_namespaces(root: &Path) -> Vec<String> {
-    let mods = namespaces(root);
-    let mut out = vec!["minecraft".to_owned()];
-    if !mods.is_empty() {
-        out.push("c".to_owned());
-        out.extend(mods);
-    }
-    out
-}
-
 /// Bundles of block tag files (tag id → the tag file's text).
 const TAG_BUNDLES: [&str; 2] = ["block-tags.json", "worldgen/block_tags.json"];
 /// The worldgen loader's bundle of biome tags.
diff --git a/crates/horizon-client/src/particles.rs b/crates/horizon-client/src/particles.rs
index a9bed143a..7d8fcd5e6 100644
--- a/crates/horizon-client/src/particles.rs
+++ b/crates/horizon-client/src/particles.rs
@@ -24,6 +24,7 @@ use std::{
 };
 
 pub use horizon_client_core::particle_type::ParticleType;
+pub use horizon_items::firework::{DYE_FIREWORK_COLORS, FireworkExplosion, FireworkShape};
 
 /// `ParticleOptions` with the parameters of the option classes used here.
 #[derive(Clone, Debug)]
@@ -3838,6 +3839,38 @@ fn lifetime_alpha(a: [f32; 4], age: i32, lifetime: i32, partial: f32) -> f32 {
     a[0] + (a[1] - a[0]) * t.clamp(0.0, 1.0)
 }
 
+struct Starter {
+    at: [f64; 3],
+    v: [f64; 3],
+    explosions: Vec<FireworkExplosion>,
+    life: i32,
+    lifetime: i32,
+    twinkle_delay: bool,
+    far: bool,
+}
+const STAR: [[f64; 2]; 6] = [
+    [0.0, 1.0],
+    [0.3455, 0.309],
+    [0.9511, 0.309],
+    [0.379_591_836_734_693_9, -0.126_530_612_244_897_95],
+    [0.612_244_897_959_183_7, -0.804_081_632_653_061_2],
+    [0.0, -0.359_183_673_469_387_73],
+];
+const CREEPER: [[f64; 2]; 12] = [
+    [0.0, 0.2],
+    [0.2, 0.2],
+    [0.2, 0.6],
+    [0.6, 0.6],
+    [0.6, 0.2],
+    [0.2, 0.2],
+    [0.2, 0.0],
+    [0.4, 0.0],
+    [0.4, -0.6],
+    [0.2, -0.6],
+    [0.2, -0.4],
+    [0.0, -0.4],
+];
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -4025,92 +4058,3 @@ mod tests {
         assert!((lifetime_alpha(a, 40, 40, 0.0) - 0.6).abs() < 1e-6);
     }
 }
-/// FireworkExplosion.Shape.
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Default)]
-pub enum FireworkShape {
-    #[default]
-    SmallBall,
-    LargeBall,
-    Star,
-    Creeper,
-    Burst,
-}
-impl FireworkShape {
-    pub fn from_name(name: &str) -> Self {
-        match name {
-            "large_ball" => Self::LargeBall,
-            "star" => Self::Star,
-            "creeper" => Self::Creeper,
-            "burst" => Self::Burst,
-            _ => Self::SmallBall,
-        }
-    }
-    pub fn name(self) -> &'static str {
-        match self {
-            Self::SmallBall => "small_ball",
-            Self::LargeBall => "large_ball",
-            Self::Star => "star",
-            Self::Creeper => "creeper",
-            Self::Burst => "burst",
-        }
-    }
-}
-/// `DyeColor` names and `getFireworkColor`, by dye id (white to black).
-pub const DYE_FIREWORK_COLORS: [(&str, u32); 16] = [
-    ("white", 0xF0F0F0),
-    ("orange", 0xEB8844),
-    ("magenta", 0xC354CD),
-    ("light_blue", 0x6689D3),
-    ("yellow", 0xDECF2A),
-    ("lime", 0x41CD34),
-    ("pink", 0xD88198),
-    ("gray", 0x434343),
-    ("light_gray", 0xABABAB),
-    ("cyan", 0x287697),
-    ("purple", 0x7B2FBE),
-    ("blue", 0x253192),
-    ("brown", 0x51301A),
-    ("green", 0x3B511A),
-    ("red", 0xB3312C),
-    ("black", 0x1E1B1B),
-];
-/// The `firework_explosion` component.
-#[derive(Clone, Debug, Default, PartialEq, Eq)]
-pub struct FireworkExplosion {
-    pub shape: FireworkShape,
-    pub colors: Vec<u32>,
-    pub fade: Vec<u32>,
-    pub trail: bool,
-    pub twinkle: bool,
-}
-struct Starter {
-    at: [f64; 3],
-    v: [f64; 3],
-    explosions: Vec<FireworkExplosion>,
-    life: i32,
-    lifetime: i32,
-    twinkle_delay: bool,
-    far: bool,
-}
-const STAR: [[f64; 2]; 6] = [
-    [0.0, 1.0],
-    [0.3455, 0.309],
-    [0.9511, 0.309],
-    [0.379_591_836_734_693_9, -0.126_530_612_244_897_95],
-    [0.612_244_897_959_183_7, -0.804_081_632_653_061_2],
-    [0.0, -0.359_183_673_469_387_73],
-];
-const CREEPER: [[f64; 2]; 12] = [
-    [0.0, 0.2],
-    [0.2, 0.2],
-    [0.2, 0.6],
-    [0.6, 0.6],
-    [0.6, 0.2],
-    [0.2, 0.2],
-    [0.2, 0.0],
-    [0.4, 0.0],
-    [0.4, -0.6],
-    [0.2, -0.6],
-    [0.2, -0.4],
-    [0.0, -0.4],
-];
diff --git a/crates/horizon-client/src/save.rs b/crates/horizon-client/src/save.rs
index d304da145..3734da606 100644
--- a/crates/horizon-client/src/save.rs
+++ b/crates/horizon-client/src/save.rs
@@ -104,27 +104,8 @@ pub fn chunks_with_block_entities<'a>(
         .collect()
 }
 
-fn string(s: &str) -> Tag {
-    Tag::String(s.into())
-}
-pub fn text(tag: Option<&Tag>) -> Option<String> {
-    match tag {
-        Some(Tag::String(s)) => Some(s.to_string_lossy()),
-        _ => None,
-    }
-}
-/// Any numeric tag as i64 (vanilla's `getIntOr` etc. accept every number type).
-pub fn number(tag: Option<&Tag>) -> Option<i64> {
-    Some(match tag? {
-        Tag::Byte(v) => i64::from(*v),
-        Tag::Short(v) => i64::from(*v),
-        Tag::Int(v) => i64::from(*v),
-        Tag::Long(v) => *v,
-        Tag::Float(b) => f32::from_bits(*b) as i64,
-        Tag::Double(b) => f64::from_bits(*b) as i64,
-        _ => return None,
-    })
-}
+use horizon_client_core::nbt_value::string;
+pub use horizon_client_core::nbt_value::{number, text};
 pub(crate) fn float(tag: Option<&Tag>) -> Option<f64> {
     Some(match tag? {
         Tag::Float(b) => f64::from(f32::from_bits(*b)),
@@ -412,62 +393,9 @@ fn fluid_id(name: &str) -> Option<u32> {
     } as u32)
 }
 
-fn encode_item(stack: &crate::items::ItemStack) -> Vec<(&'static str, Tag)> {
-    let mut entries = vec![
-        ("id", string(&stack.item)),
-        ("count", Tag::Int(stack.count as i32)),
-    ];
-    if let Some(components) = crate::item_data::encode_components(stack) {
-        entries.push(("components", components));
-    }
-    entries
-}
-/// ItemStack.CODEC (id, count, components).
-pub fn item_to_nbt(stack: &crate::items::ItemStack) -> Tag {
-    Tag::compound(encode_item(stack))
-}
-pub fn item_from_nbt(tag: &Tag) -> Option<crate::items::ItemStack> {
-    let id = text(tag.get("id"))?;
-    if id == "minecraft:air" {
-        return None;
-    }
-    let count = number(tag.get("count"))
-        .or_else(|| number(tag.get("Count")))
-        .unwrap_or(1)
-        .max(1) as u32;
-    let (damage, extra) = crate::item_data::decode_components(tag.get("components"));
-    Some(crate::items::ItemStack {
-        item: Arc::from(id.as_str()),
-        count,
-        damage,
-        extra,
-    })
-}
-pub fn encode_items(slots: &[Option<crate::items::ItemStack>]) -> Tag {
-    Tag::List(
-        slots
-            .iter()
-            .enumerate()
-            .filter_map(|(i, s)| {
-                let mut entries = vec![("Slot", Tag::Byte(i as i8))];
-                entries.extend(encode_item(s.as_ref()?));
-                Some(Tag::compound(entries))
-            })
-            .collect(),
-    )
-}
-pub fn decode_items(tag: Option<&Tag>, size: usize) -> Vec<Option<crate::items::ItemStack>> {
-    let mut slots = vec![None; size];
-    if let Some(Tag::List(items)) = tag {
-        for it in items {
-            let slot = number(it.get("Slot")).unwrap_or(0) as u8 as usize;
-            if let Some(cell) = slots.get_mut(slot) {
-                *cell = item_from_nbt(it);
-            }
-        }
-    }
-    slots
-}
+pub use horizon_items::item_nbt::{
+    decode_items, encode_item, encode_items, item_from_nbt, item_to_nbt,
+};
 /// The block entity type ID for the block it sits in (a chest-like container
 /// is a chest, trapped chest or barrel).
 fn block_entity_id(e: &crate::containers::BlockEntity, block: &str) -> String {
diff --git a/crates/horizon-client/src/sound_engine.rs b/crates/horizon-client/src/sound_engine.rs
index 562b14100..f3e2dd75d 100644
--- a/crates/horizon-client/src/sound_engine.rs
+++ b/crates/horizon-client/src/sound_engine.rs
@@ -53,6 +53,11 @@ pub enum Ticking {
     Minecart { cart: u32 },
     /// `RidingMinecartSoundInstance` for the player riding a minecart.
     RidingMinecart { cart: u32, underwater: bool },
+    /// `BeeFlyingSoundInstance`, or `BeeAggressiveSoundInstance` when
+    /// `aggressive`.
+    Bee { bee: u32, aggressive: bool },
+    /// `GuardianAttackSoundInstance`.
+    GuardianAttack { guardian: u32 },
 }
 /// What a minecart's sound instances read about it.
 #[derive(Clone, Copy, Debug)]
@@ -62,6 +67,21 @@ pub struct CartSound {
     /// `getDeltaMovement().horizontalDistance()`.
     pub speed: f64,
 }
+/// What a bee's or a guardian's sound instance reads about it.
+#[derive(Clone, Copy, Debug)]
+pub struct MobSound {
+    pub id: u32,
+    pub position: [f64; 3],
+    /// `getDeltaMovement().horizontalDistance()`.
+    pub speed: f64,
+    pub baby: bool,
+    /// `Bee.isAngry`.
+    pub angry: bool,
+    /// `isSilent`.
+    pub silent: bool,
+    /// `Guardian.getAttackAnimationScale(0)`.
+    pub attack_scale: f32,
+}
 /// What tickable instances read about the player and the entities they follow.
 #[derive(Clone, Debug, Default)]
 pub struct TickContext {
@@ -71,6 +91,8 @@ pub struct TickContext {
     pub vehicle: Option<u32>,
     /// The minecarts in the level (a missing one has been removed).
     pub carts: Vec<CartSound>,
+    /// The bees and guardians in the level (a missing one has been removed).
+    pub mobs: Vec<MobSound>,
     /// `!tickRateManager().runsNormally()`.
     pub frozen: bool,
 }
@@ -315,6 +337,59 @@ impl SoundInstance {
         };
         s
     }
+    /// `new BeeFlyingSoundInstance(bee)` (or `BeeAggressiveSoundInstance`):
+    /// silent until the bee moves.
+    pub fn bee(bee: &MobSound, aggressive: bool, random: LegacyRandom) -> Self {
+        let id = if aggressive {
+            "minecraft:entity.bee.loop_aggressive"
+        } else {
+            "minecraft:entity.bee.loop"
+        };
+        let [x, y, z] = bee.position;
+        let mut s = Self::new(
+            id,
+            NEUTRAL,
+            0.0,
+            1.0,
+            random,
+            true,
+            0,
+            Attenuation::Linear,
+            [
+                f64::from(x as f32),
+                f64::from(y as f32),
+                f64::from(z as f32),
+            ],
+            false,
+        );
+        s.can_start_silent = true;
+        s.ticking = Ticking::Bee {
+            bee: bee.id,
+            aggressive,
+        };
+        s
+    }
+    /// `new GuardianAttackSoundInstance(guardian)`: the guardian's own volume
+    /// and pitch until its first tick, heard everywhere.
+    pub fn guardian_attack(guardian: &MobSound, random: LegacyRandom) -> Self {
+        let id = "minecraft:entity.guardian.attack";
+        let mut s = Self::new(
+            id,
+            crate::settings::sound_source(id),
+            1.0,
+            1.0,
+            random,
+            true,
+            0,
+            Attenuation::None,
+            guardian.position,
+            false,
+        );
+        s.ticking = Ticking::GuardianAttack {
+            guardian: guardian.id,
+        };
+        s
+    }
     pub fn tickable(&self) -> bool {
         self.ticking != Ticking::No
     }
@@ -389,6 +464,54 @@ impl SoundInstance {
                     0.0
                 };
             }
+            Ticking::Bee { bee, aggressive } => {
+                let (id, aggressive) = (*bee, *aggressive);
+                // canPlaySound, then shouldSwitchSounds: the other kind of
+                // instance is started in this one's place.
+                let Some(bee) = ctx
+                    .mobs
+                    .iter()
+                    .find(|m| m.id == id)
+                    .filter(|m| !m.silent && m.angry == aggressive)
+                else {
+                    self.stop();
+                    return;
+                };
+                let [x, y, z] = bee.position;
+                self.position = [
+                    f64::from(x as f32),
+                    f64::from(y as f32),
+                    f64::from(z as f32),
+                ];
+                let (min, max) = if bee.baby { (1.1, 1.5) } else { (0.7, 1.1) };
+                let speed = bee.speed as f32;
+                if speed >= 0.01 {
+                    // Mth.lerp(Mth.clamp(speed, min, max), min, max).
+                    self.pitch = min + speed.clamp(min, max) * (max - min);
+                    self.volume = speed.clamp(0.0, 0.5) * 1.2;
+                } else {
+                    self.pitch = 0.0;
+                    self.volume = 0.0;
+                }
+            }
+            Ticking::GuardianAttack { guardian } => {
+                let id = *guardian;
+                // The client's guardian never has a target of its own, so
+                // only its removal or silence ends the loop.
+                let Some(guardian) = ctx.mobs.iter().find(|m| m.id == id && !m.silent) else {
+                    self.stop();
+                    return;
+                };
+                let [x, y, z] = guardian.position;
+                self.position = [
+                    f64::from(x as f32),
+                    f64::from(y as f32),
+                    f64::from(z as f32),
+                ];
+                let scale = guardian.attack_scale;
+                self.volume = 0.0 + 1.0 * scale * scale;
+                self.pitch = 0.7 + 0.5 * scale;
+            }
             Ticking::RidingMinecart { cart, underwater } => {
                 let (id, underwater) = (*cart, *underwater);
                 let found = ctx.carts.iter().find(|c| c.id == id);
diff --git a/crates/horizon-client/src/spear.rs b/crates/horizon-client/src/spear.rs
index ae6d8f80d..ed32b269a 100644
--- a/crates/horizon-client/src/spear.rs
+++ b/crates/horizon-client/src/spear.rs
@@ -2,6 +2,7 @@
 //! conditions of a stab, `Item.Properties.spear`'s numbers) and
 //! `SpearAnimations` (how the spear is held in first and third person while
 //! it charges).
+use crate::first_person::SwingAnimation;
 use glam::{Mat4, Vec3};
 use horizon_core::{geometry::trig::Mth, jmath::pow};
 use std::f32::consts::PI;
@@ -39,6 +40,10 @@ pub struct Kinetic {
     pub damage_multiplier: f32,
     pub sound: &'static str,
     pub hit_sound: &'static str,
+    /// The `attack_animation` duration, and the `piercing_weapon` sound of a
+    /// jab.
+    pub attack_ticks: i32,
+    pub attack_sound: &'static str,
 }
 
 /// `AttackRange` of a spear: the reach of its stabs.
@@ -62,16 +67,17 @@ pub const REACH: Reach = Reach {
 impl Kinetic {
     /// The `kinetic_weapon` of a spear item (`Item.Properties.spear`).
     pub fn of(item: &str) -> Option<Self> {
-        // (damage multiplier, delay, dismount time and speed, knockback time
-        // and speed, damage time and speed): seconds and blocks per second.
-        let (multiplier, delay, dismount, knockback, damage) = match item {
-            "minecraft:wooden_spear" => (0.7, 0.75, (5.0, 14.0), (10.0, 5.1), (15.0, 4.6)),
-            "minecraft:stone_spear" => (0.82, 0.7, (4.5, 13.0), (9.0, 5.1), (13.75, 4.6)),
-            "minecraft:copper_spear" => (0.82, 0.65, (4.0, 12.0), (8.25, 5.1), (12.5, 4.6)),
-            "minecraft:iron_spear" => (0.95, 0.6, (2.5, 11.0), (6.75, 5.1), (11.25, 4.6)),
-            "minecraft:golden_spear" => (0.7, 0.7, (3.5, 13.0), (8.5, 5.1), (13.75, 4.6)),
-            "minecraft:diamond_spear" => (1.075, 0.5, (3.0, 10.0), (6.5, 5.1), (10.0, 4.6)),
-            "minecraft:netherite_spear" => (1.2, 0.4, (2.5, 9.0), (5.5, 5.1), (8.75, 4.6)),
+        // (attack duration, damage multiplier, delay, dismount time and
+        // speed, knockback time and speed, damage time and speed): seconds
+        // and blocks per second.
+        let (attack, multiplier, delay, dismount, knockback, damage) = match item {
+            "minecraft:wooden_spear" => (0.65, 0.7, 0.75, (5.0, 14.0), (10.0, 5.1), (15.0, 4.6)),
+            "minecraft:stone_spear" => (0.75, 0.82, 0.7, (4.5, 13.0), (9.0, 5.1), (13.75, 4.6)),
+            "minecraft:copper_spear" => (0.85, 0.82, 0.65, (4.0, 12.0), (8.25, 5.1), (12.5, 4.6)),
+            "minecraft:iron_spear" => (0.95, 0.95, 0.6, (2.5, 11.0), (6.75, 5.1), (11.25, 4.6)),
+            "minecraft:golden_spear" => (0.95, 0.7, 0.7, (3.5, 13.0), (8.5, 5.1), (13.75, 4.6)),
+            "minecraft:diamond_spear" => (1.05, 1.075, 0.5, (3.0, 10.0), (6.5, 5.1), (10.0, 4.6)),
+            "minecraft:netherite_spear" => (1.15, 1.2, 0.4, (2.5, 9.0), (5.5, 5.1), (8.75, 4.6)),
             _ => return None,
         };
         let wood = item == "minecraft:wooden_spear";
@@ -107,8 +113,23 @@ impl Kinetic {
             } else {
                 "minecraft:item.spear.hit"
             },
+            attack_ticks: ticks(attack),
+            attack_sound: if wood {
+                "minecraft:item.spear_wood.attack"
+            } else {
+                "minecraft:item.spear.attack"
+            },
         })
     }
+
+    /// The spear's `attack_animation`: a STAB (`SwingAnimationType` 2) as long
+    /// as its attack duration.
+    pub fn attack_animation(&self) -> SwingAnimation {
+        SwingAnimation {
+            kind: 2,
+            duration: self.attack_ticks,
+        }
+    }
 }
 
 /// `KineticWeapon.HIT_FEEDBACK_TICKS`.
diff --git a/crates/horizon-items/Cargo.toml b/crates/horizon-items/Cargo.toml
new file mode 100644
index 000000000..0662999bf
--- /dev/null
+++ b/crates/horizon-items/Cargo.toml
@@ -0,0 +1,21 @@
+[package]
+name = "horizon-items"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+rust-version = "1.90"
+description = "Blocks and items as the client knows them: block facts, item stacks and their data components, enchantments, cooldowns, bundles, and items in NBT"
+
+[dependencies]
+horizon-client-core = { path = "../horizon-client-core" }
+horizon-core = { path = "../horizon-core" }
+horizon-world = { path = "../horizon-world" }
+serde = { version = "1", features = ["derive"] }
+serde_json = { version = "1.0.151", features = ["raw_value"] }
+
+[features]
+# Test helpers (`Items::for_tests`, `enchant::tests`) for horizon-client's unit tests.
+test-support = []
+
+[lints]
+workspace = true
diff --git a/crates/horizon-items/src/banner_layer.rs b/crates/horizon-items/src/banner_layer.rs
new file mode 100644
index 000000000..5f76ad575
--- /dev/null
+++ b/crates/horizon-items/src/banner_layer.rs
@@ -0,0 +1,56 @@
+//! Banner pattern layers (`BannerPatternLayers`) and their NBT form.
+use horizon_world::nbt::Tag;
+use std::sync::Arc;
+
+/// `BannerPatternLayers.Layer`: a pattern id and the dye name it is painted in.
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct BannerLayer {
+    pub pattern: Arc<str>,
+    pub color: Arc<str>,
+}
+impl BannerLayer {
+    pub fn new(pattern: &str, color: &str) -> Self {
+        Self {
+            pattern: Arc::from(pattern),
+            color: Arc::from(color),
+        }
+    }
+}
+
+/// The `banner_patterns` NBT list of layers.
+pub fn layers_to_nbt(layers: &[BannerLayer]) -> Tag {
+    Tag::List(
+        layers
+            .iter()
+            .map(|l| {
+                Tag::compound([
+                    ("pattern", Tag::String((&*l.pattern).into())),
+                    ("color", Tag::String((&*l.color).into())),
+                ])
+            })
+            .collect(),
+    )
+}
+pub fn layers_from_nbt(tag: Option<&Tag>) -> Vec<BannerLayer> {
+    let Some(Tag::List(list)) = tag else {
+        return Vec::new();
+    };
+    list.iter()
+        .filter_map(|e| {
+            let text = |k: &str| match e.get(k) {
+                Some(Tag::String(s)) => Some(s.to_string_lossy()),
+                _ => None,
+            };
+            let pattern = text("pattern")?;
+            let color = text("color")?;
+            Some(BannerLayer::new(
+                &if pattern.contains(':') {
+                    pattern
+                } else {
+                    format!("minecraft:{pattern}")
+                },
+                &color,
+            ))
+        })
+        .collect()
+}
diff --git a/crates/horizon-client/src/blocks.rs b/crates/horizon-items/src/blocks.rs
similarity index 100%
rename from crates/horizon-client/src/blocks.rs
rename to crates/horizon-items/src/blocks.rs
diff --git a/crates/horizon-client/src/blocks/decode.rs b/crates/horizon-items/src/blocks/decode.rs
similarity index 100%
rename from crates/horizon-client/src/blocks/decode.rs
rename to crates/horizon-items/src/blocks/decode.rs
diff --git a/crates/horizon-client/src/blocks/decode_tests.rs b/crates/horizon-items/src/blocks/decode_tests.rs
similarity index 100%
rename from crates/horizon-client/src/blocks/decode_tests.rs
rename to crates/horizon-items/src/blocks/decode_tests.rs
diff --git a/crates/horizon-client/src/bundle.rs b/crates/horizon-items/src/bundle.rs
similarity index 97%
rename from crates/horizon-client/src/bundle.rs
rename to crates/horizon-items/src/bundle.rs
index 545283b4c..f32d23a5d 100644
--- a/crates/horizon-client/src/bundle.rs
+++ b/crates/horizon-items/src/bundle.rs
@@ -375,14 +375,7 @@ mod tooltip_tests {
     /// The prepared resources, when they are on this machine: the tooltip
     /// asks the item registry whether a stack is a bundle.
     fn items() -> Option<Items> {
-        let root = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
-            .join("../../.local/horizon-client/26.3");
-        if !root.join("items.json").exists() {
-            return None;
-        }
-        let assets = crate::assets::Assets::load(&root).ok()?;
-        let facts = crate::blocks::BlockFacts::load(&root, assets.registry).ok()?;
-        Items::load(&root, assets.registry, &facts).ok()
+        crate::items::prepared_items()
     }
 
     fn bundle_with(counts: &[(&str, u32)]) -> ItemStack {
diff --git a/crates/horizon-items/src/content_namespaces.rs b/crates/horizon-items/src/content_namespaces.rs
new file mode 100644
index 000000000..07d4c5685
--- /dev/null
+++ b/crates/horizon-items/src/content_namespaces.rs
@@ -0,0 +1,29 @@
+//! The namespaces content mods add to a resource root, which loaders read
+//! besides `minecraft`.
+use std::{fs, path::Path};
+
+/// In a root built here: the namespaces the content mods own (their ids and
+/// listed namespaces), which loaders read besides `minecraft`.
+pub const MARKER: &str = "horizon-mod-content.json";
+
+/// The content mods' namespaces in a root built by `mod_content::build`; none in any
+/// other root, so vanilla's loaders read exactly what they did.
+pub fn namespaces(root: &Path) -> Vec<String> {
+    fs::read(root.join(MARKER))
+        .ok()
+        .and_then(|b| serde_json::from_slice(&b).ok())
+        .unwrap_or_default()
+}
+
+/// The namespaces whose tags loaders read in `root`: `minecraft`, and in a
+/// root built by `mod_content::build` the convention tags (`c`, shared between mods as
+/// on NeoForge and Fabric) and the content mods' own.
+pub fn tag_namespaces(root: &Path) -> Vec<String> {
+    let mods = namespaces(root);
+    let mut out = vec!["minecraft".to_owned()];
+    if !mods.is_empty() {
+        out.push("c".to_owned());
+        out.extend(mods);
+    }
+    out
+}
diff --git a/crates/horizon-client/src/cooldowns.rs b/crates/horizon-items/src/cooldowns.rs
similarity index 100%
rename from crates/horizon-client/src/cooldowns.rs
rename to crates/horizon-items/src/cooldowns.rs
diff --git a/crates/horizon-client/src/enchant.rs b/crates/horizon-items/src/enchant.rs
similarity index 99%
rename from crates/horizon-client/src/enchant.rs
rename to crates/horizon-items/src/enchant.rs
index 73b9bf090..169b0eade 100644
--- a/crates/horizon-client/src/enchant.rs
+++ b/crates/horizon-items/src/enchant.rs
@@ -334,14 +334,14 @@ impl Enchantments {
     }
     /// `Enchantment.getFullname` as plain text and whether it is a curse (red).
     pub fn full_name(&self, id: &str, level: u32) -> (String, bool) {
-        let language = crate::lang::current();
+        let language = horizon_client_core::lang::current();
         self.full_name_in(language.as_deref(), id, level)
     }
     /// `full_name` against `language`; `None` (no language loaded: a
     /// dedicated server, the probes) keeps the English names loaded above.
     pub fn full_name_in(
         &self,
-        language: Option<&crate::lang::Language>,
+        language: Option<&horizon_client_core::lang::Language>,
         id: &str,
         level: u32,
     ) -> (String, bool) {
@@ -802,8 +802,8 @@ pub fn apply_value_effect(
     }
 }
 
-#[cfg(test)]
-pub(crate) mod tests {
+#[cfg(any(test, feature = "test-support"))]
+pub mod tests {
     use super::*;
     use serde_json::json;
 
@@ -1136,7 +1136,7 @@ pub(crate) mod tests {
     #[test]
     fn names_follow_the_language() {
         struct Mem(HashMap<String, Vec<u8>>);
-        impl crate::lang::ResourceSource for Mem {
+        impl horizon_client_core::lang::ResourceSource for Mem {
             fn read(&self, path: &str) -> Option<Vec<u8>> {
                 self.0.get(path).cloned()
             }
@@ -1147,7 +1147,7 @@ pub(crate) mod tests {
                 .as_bytes()
                 .to_vec(),
         )]));
-        let ru = crate::lang::Language::load(&[&ru], "ru_ru");
+        let ru = horizon_client_core::lang::Language::load(&[&ru], "ru_ru");
         let e = sample();
         assert_eq!(
             e.full_name_in(Some(&ru), "minecraft:sharpness", 5).0,
diff --git a/crates/horizon-items/src/firework.rs b/crates/horizon-items/src/firework.rs
new file mode 100644
index 000000000..9e6668e5d
--- /dev/null
+++ b/crates/horizon-items/src/firework.rs
@@ -0,0 +1,61 @@
+//! Firework explosions (the `firework_explosion` component and its shapes) and
+//! the dye colours fireworks use.
+
+/// FireworkExplosion.Shape.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Default)]
+pub enum FireworkShape {
+    #[default]
+    SmallBall,
+    LargeBall,
+    Star,
+    Creeper,
+    Burst,
+}
+impl FireworkShape {
+    pub fn from_name(name: &str) -> Self {
+        match name {
+            "large_ball" => Self::LargeBall,
+            "star" => Self::Star,
+            "creeper" => Self::Creeper,
+            "burst" => Self::Burst,
+            _ => Self::SmallBall,
+        }
+    }
+    pub fn name(self) -> &'static str {
+        match self {
+            Self::SmallBall => "small_ball",
+            Self::LargeBall => "large_ball",
+            Self::Star => "star",
+            Self::Creeper => "creeper",
+            Self::Burst => "burst",
+        }
+    }
+}
+/// `DyeColor` names and `getFireworkColor`, by dye id (white to black).
+pub const DYE_FIREWORK_COLORS: [(&str, u32); 16] = [
+    ("white", 0xF0F0F0),
+    ("orange", 0xEB8844),
+    ("magenta", 0xC354CD),
+    ("light_blue", 0x6689D3),
+    ("yellow", 0xDECF2A),
+    ("lime", 0x41CD34),
+    ("pink", 0xD88198),
+    ("gray", 0x434343),
+    ("light_gray", 0xABABAB),
+    ("cyan", 0x287697),
+    ("purple", 0x7B2FBE),
+    ("blue", 0x253192),
+    ("brown", 0x51301A),
+    ("green", 0x3B511A),
+    ("red", 0xB3312C),
+    ("black", 0x1E1B1B),
+];
+/// The `firework_explosion` component.
+#[derive(Clone, Debug, Default, PartialEq, Eq)]
+pub struct FireworkExplosion {
+    pub shape: FireworkShape,
+    pub colors: Vec<u32>,
+    pub fade: Vec<u32>,
+    pub trail: bool,
+    pub twinkle: bool,
+}
diff --git a/crates/horizon-client/src/item_data.rs b/crates/horizon-items/src/item_data.rs
similarity index 96%
rename from crates/horizon-client/src/item_data.rs
rename to crates/horizon-items/src/item_data.rs
index f5ff99939..cfcbae869 100644
--- a/crates/horizon-client/src/item_data.rs
+++ b/crates/horizon-items/src/item_data.rs
@@ -28,7 +28,7 @@ pub struct StackData {
     pub charged: Vec<ItemStack>,
     /// `minecraft:fireworks`: flight duration and explosions (None: the
     /// item's default).
-    pub fireworks: Option<(u8, Vec<crate::particles::FireworkExplosion>)>,
+    pub fireworks: Option<(u8, Vec<crate::firework::FireworkExplosion>)>,
     /// `minecraft:map_id` (filled maps).
     pub map_id: Option<i32>,
     /// `minecraft:writable_book_content` pages.
@@ -36,7 +36,7 @@ pub struct StackData {
     /// `minecraft:written_book_content`.
     pub written: Option<WrittenBook>,
     /// `minecraft:banner_patterns` (banners and shields).
-    pub banner_patterns: Vec<crate::banner::BannerLayer>,
+    pub banner_patterns: Vec<crate::banner_layer::BannerLayer>,
     /// `minecraft:base_color` (a shield's dye).
     pub base_color: Option<Arc<str>>,
     /// The raid captain's banner: `minecraft:banner_patterns` with the
@@ -47,7 +47,7 @@ pub struct StackData {
     /// `minecraft:dyed_color` (leather armour, wolf armour, ... as RGB).
     pub dyed_color: Option<i32>,
     /// `minecraft:firework_explosion` (a firework star).
-    pub firework_explosion: Option<crate::particles::FireworkExplosion>,
+    pub firework_explosion: Option<crate::firework::FireworkExplosion>,
     /// `minecraft:pot_decorations`: back, left, right, front sherds.
     pub pot_decorations: Option<Box<[Option<ItemStack>; 4]>>,
     /// `minecraft:bundle_contents`.
@@ -109,7 +109,7 @@ impl StackData {
     /// `SetNameFunction.run`: a loot text component stored as `custom_name`
     /// (plain text, as modelled) or as the unmodelled `item_name`.
     pub fn set_loot_name(&mut self, id: &str, text: &serde_json::Value) {
-        let tag = crate::scoreboard::json_to_tag(text);
+        let tag = horizon_client_core::scoreboard::json_to_tag(text);
         if id == "minecraft:custom_name" {
             self.custom_name = read_text(&tag);
         } else {
@@ -252,7 +252,7 @@ impl ItemStack {
     /// by `ominous_banner` instead.
     pub fn item_name(&self) -> Option<String> {
         let name = self.data()?.other("minecraft:item_name")?;
-        Some(crate::entity_nbt::name_text(name).plain())
+        Some(horizon_client_core::component::name_text(name).plain())
     }
     pub fn potion(&self) -> Option<&str> {
         self.data().and_then(|d| d.potion.as_deref())
@@ -364,13 +364,15 @@ fn read_text(t: &Tag) -> Option<String> {
         // this), so flatten the whole component instead of reading one key.
         // ComponentSerialization.CODEC also takes a list (its first element
         // styling the rest), as servers behind ViaVersion send book pages.
-        Tag::Compound(_) | Tag::List(_) => Some(crate::entity_nbt::name_text(t).plain()),
+        Tag::Compound(_) | Tag::List(_) => {
+            Some(horizon_client_core::component::name_text(t).plain())
+        }
         _ => None,
     }
 }
 
 /// A `FireworkExplosion` as vanilla's codec writes it (defaults omitted).
-fn explosion_tag(e: &crate::particles::FireworkExplosion) -> Tag {
+fn explosion_tag(e: &crate::firework::FireworkExplosion) -> Tag {
     let colors = |c: &[u32]| Tag::List(c.iter().map(|c| Tag::Int(*c as i32)).collect());
     let mut fields = vec![("shape", Tag::String(e.shape.name().into()))];
     if !e.colors.is_empty() {
@@ -387,14 +389,14 @@ fn explosion_tag(e: &crate::particles::FireworkExplosion) -> Tag {
     }
     Tag::compound(fields)
 }
-fn explosion_from(e: &Tag) -> crate::particles::FireworkExplosion {
+fn explosion_from(e: &Tag) -> crate::firework::FireworkExplosion {
     let ints = |t: Option<&Tag>| match t {
         Some(Tag::IntArray(v)) => v.iter().map(|c| *c as u32).collect(),
         Some(Tag::List(v)) => v.iter().filter_map(int).map(|c| c as u32).collect(),
         _ => Vec::new(),
     };
-    crate::particles::FireworkExplosion {
-        shape: crate::particles::FireworkShape::from_name(
+    crate::firework::FireworkExplosion {
+        shape: crate::firework::FireworkShape::from_name(
             e.get("shape")
                 .and_then(string)
                 .as_deref()
@@ -442,7 +444,7 @@ fn template_from(tag: &Tag) -> Option<ItemStack> {
 /// The stack a `show_item` hover event holds (`HoverEvent.ShowItem`): its
 /// `{id, count?, components?}` object.
 pub fn stack_from_hover(event: &serde_json::Value) -> Option<ItemStack> {
-    template_from(&crate::scoreboard::json_to_tag(event))
+    template_from(&horizon_client_core::scoreboard::json_to_tag(event))
 }
 /// Sorted-key, type-annotated text of a tag (the differential harnesses
 /// print the same form from the vanilla side).
@@ -508,7 +510,7 @@ pub fn canon_tag(tag: &Tag) -> String {
 pub fn canon_stack(stack: Option<&ItemStack>) -> String {
     stack.map_or_else(
         || "-".to_owned(),
-        |s| canon_tag(&crate::save::item_to_nbt(s)),
+        |s| canon_tag(&crate::item_nbt::item_to_nbt(s)),
     )
 }
 /// The stack of an SNBT `ItemStack.CODEC` compound; None for "-".
@@ -517,7 +519,7 @@ pub fn parse_stack(snbt: &str) -> Result<Option<ItemStack>, String> {
         return Ok(None);
     }
     let (tag, _) = horizon_world::nbt::parse_snbt(snbt)?;
-    Ok(crate::save::item_from_nbt(&tag))
+    Ok(crate::item_nbt::item_from_nbt(&tag))
 }
 /// The `components` compound for a stack, or None when every component is default.
 pub fn encode_components(stack: &ItemStack) -> Option<Tag> {
@@ -566,7 +568,7 @@ pub fn components_tag(damage: u32, data: Option<&StackData>) -> Option<Tag> {
         if !d.banner_patterns.is_empty() {
             entries.push((
                 "minecraft:banner_patterns",
-                crate::banner::layers_to_nbt(&d.banner_patterns),
+                crate::banner_layer::layers_to_nbt(&d.banner_patterns),
             ));
         }
         if let Some(color) = &d.base_color {
@@ -669,7 +671,7 @@ pub fn components_tag(damage: u32, data: Option<&StackData>) -> Option<Tag> {
         if !d.charged.is_empty() {
             entries.push((
                 "minecraft:charged_projectiles",
-                Tag::List(d.charged.iter().map(crate::save::item_to_nbt).collect()),
+                Tag::List(d.charged.iter().map(crate::item_nbt::item_to_nbt).collect()),
             ));
         }
         if d.ominous_banner {
@@ -752,7 +754,7 @@ pub fn decode_components(components: Option<&Tag>) -> (u32, Option<Box<StackData
         custom_name: c.get("minecraft:custom_name").and_then(read_text),
         potion,
         map_id: c.get("minecraft:map_id").and_then(int).map(|v| v as i32),
-        banner_patterns: crate::banner::layers_from_nbt(c.get("minecraft:banner_patterns")),
+        banner_patterns: crate::banner_layer::layers_from_nbt(c.get("minecraft:banner_patterns")),
         base_color: c
             .get("minecraft:base_color")
             .and_then(string)
@@ -831,7 +833,10 @@ pub fn decode_components(components: Option<&Tag>) -> (u32, Option<Box<StackData
             None => None,
         },
         charged: match c.get("minecraft:charged_projectiles") {
-            Some(Tag::List(list)) => list.iter().filter_map(crate::save::item_from_nbt).collect(),
+            Some(Tag::List(list)) => list
+                .iter()
+                .filter_map(crate::item_nbt::item_from_nbt)
+                .collect(),
             _ => Vec::new(),
         },
         container: match c.get("minecraft:container") {
@@ -1010,8 +1015,8 @@ mod tests {
         let mut stack = ItemStack::new("minecraft:shield", 1);
         stack.data_mut().base_color = Some(Arc::from("red"));
         stack.data_mut().banner_patterns = vec![
-            crate::banner::BannerLayer::new("minecraft:flower", "black"),
-            crate::banner::BannerLayer::new("minecraft:border", "white"),
+            crate::banner_layer::BannerLayer::new("minecraft:flower", "black"),
+            crate::banner_layer::BannerLayer::new("minecraft:border", "white"),
         ];
         let tag = encode_components(&stack).expect("components");
         let (_, extra) = decode_components(Some(&tag));
@@ -1082,7 +1087,7 @@ mod tests {
         assert_eq!(flight, 2);
         assert_eq!(
             explosions[0].shape,
-            crate::particles::FireworkShape::LargeBall
+            crate::firework::FireworkShape::LargeBall
         );
         assert_eq!(explosions[0].colors, vec![0xFF0000]);
         assert!(explosions[0].twinkle && !explosions[0].trail);
diff --git a/crates/horizon-items/src/item_nbt.rs b/crates/horizon-items/src/item_nbt.rs
new file mode 100644
index 000000000..e0101228b
--- /dev/null
+++ b/crates/horizon-items/src/item_nbt.rs
@@ -0,0 +1,62 @@
+//! Item stacks in NBT (`ItemStack.CODEC`): id, count and components, alone or in
+//! slot lists.
+use horizon_client_core::nbt_value::{number, string, text};
+use horizon_world::nbt::Tag;
+use std::sync::Arc;
+
+pub fn encode_item(stack: &crate::items::ItemStack) -> Vec<(&'static str, Tag)> {
+    let mut entries = vec![
+        ("id", string(&stack.item)),
+        ("count", Tag::Int(stack.count as i32)),
+    ];
+    if let Some(components) = crate::item_data::encode_components(stack) {
+        entries.push(("components", components));
+    }
+    entries
+}
+/// ItemStack.CODEC (id, count, components).
+pub fn item_to_nbt(stack: &crate::items::ItemStack) -> Tag {
+    Tag::compound(encode_item(stack))
+}
+pub fn item_from_nbt(tag: &Tag) -> Option<crate::items::ItemStack> {
+    let id = text(tag.get("id"))?;
+    if id == "minecraft:air" {
+        return None;
+    }
+    let count = number(tag.get("count"))
+        .or_else(|| number(tag.get("Count")))
+        .unwrap_or(1)
+        .max(1) as u32;
+    let (damage, extra) = crate::item_data::decode_components(tag.get("components"));
+    Some(crate::items::ItemStack {
+        item: Arc::from(id.as_str()),
+        count,
+        damage,
+        extra,
+    })
+}
+pub fn encode_items(slots: &[Option<crate::items::ItemStack>]) -> Tag {
+    Tag::List(
+        slots
+            .iter()
+            .enumerate()
+            .filter_map(|(i, s)| {
+                let mut entries = vec![("Slot", Tag::Byte(i as i8))];
+                entries.extend(encode_item(s.as_ref()?));
+                Some(Tag::compound(entries))
+            })
+            .collect(),
+    )
+}
+pub fn decode_items(tag: Option<&Tag>, size: usize) -> Vec<Option<crate::items::ItemStack>> {
+    let mut slots = vec![None; size];
+    if let Some(Tag::List(items)) = tag {
+        for it in items {
+            let slot = number(it.get("Slot")).unwrap_or(0) as u8 as usize;
+            if let Some(cell) = slots.get_mut(slot) {
+                *cell = item_from_nbt(it);
+            }
+        }
+    }
+    slots
+}
diff --git a/crates/horizon-client/src/items.rs b/crates/horizon-items/src/items.rs
similarity index 94%
rename from crates/horizon-client/src/items.rs
rename to crates/horizon-items/src/items.rs
index bd818bd76..bfb261461 100644
--- a/crates/horizon-client/src/items.rs
+++ b/crates/horizon-items/src/items.rs
@@ -310,7 +310,7 @@ fn load_songs(root: &Path) -> HashMap<String, Song> {
     }
     songs
 }
-pub(crate) fn load_tags(root: &Path, kind: &str) -> Result<HashMap<String, HashSet<String>>> {
+pub fn load_tags(root: &Path, kind: &str) -> Result<HashMap<String, HashSet<String>>> {
     Ok(load_tag_lists(root, kind)?
         .into_iter()
         .map(|(k, v)| (k, v.into_iter().collect()))
@@ -350,7 +350,7 @@ pub(crate) fn load_tag_lists(root: &Path, kind: &str) -> Result<HashMap<String,
         Ok(())
     }
     // Vanilla's tags; with content mods also the convention (`c`) tags and the mods' own.
-    for namespace in crate::mod_content::tag_namespaces(root) {
+    for namespace in crate::content_namespaces::tag_namespaces(root) {
         let dir = root.join(format!("data/{namespace}/tags/{kind}"));
         if dir.exists() {
             walk(&dir, &dir, &namespace, &mut raw)?;
@@ -605,7 +605,7 @@ impl Items {
                     consumable: c.get("minecraft:consumable").map(|cons| {
                         horizon_world::consumable::Consumable {
                             seconds: cons["consume_seconds"].as_f64().map_or(1.6, |s| s as f32),
-                            animation: crate::first_person::consumable_animation(cons),
+                            animation: crate::use_animation::consumable_animation(cons),
                             sound: cons["sound"]
                                 .as_str()
                                 .unwrap_or("minecraft:entity.generic.eat")
@@ -740,7 +740,7 @@ impl Items {
         let loot_root = root.join("data/minecraft/loot_table");
         walk_loot(&loot_root, &loot_root, "minecraft", &mut loot)?;
         // Content mods' tables (docs/modpacks.md): `<ns>:blocks/...`.
-        for namespace in crate::mod_content::namespaces(root) {
+        for namespace in crate::content_namespaces::namespaces(root) {
             let dir = root.join(format!("data/{namespace}/loot_table"));
             if dir.is_dir() {
                 walk_loot(&dir, &dir, &namespace, &mut loot)?;
@@ -779,7 +779,7 @@ impl Items {
         })
     }
     /// An item table with only tags, for unit tests of item rules.
-    #[cfg(test)]
+    #[cfg(any(test, feature = "test-support"))]
     pub fn for_tests(item_tags: HashMap<String, HashSet<String>>) -> Self {
         Self {
             items: HashMap::new(),
@@ -1754,6 +1754,22 @@ mod bucket_use_tests {
     }
 }
 
+/// The items of the prepared resources, when they are on this machine, for
+/// tests: the block registry and facts as the client's `Assets::load` reads them.
+#[cfg(test)]
+pub(crate) fn prepared_items() -> Option<Items> {
+    let root = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+        .join("../../.local/horizon-client/26.3");
+    if !root.join("items.json").exists() {
+        return None;
+    }
+    let (registry, _) =
+        BlockRegistry::from_facts_json_with_flags(fs::File::open(root.join("facts.json")).ok()?)
+            .ok()?;
+    let facts = BlockFacts::load(&root, &registry).ok()?;
+    Items::load(&root, &registry, &facts).ok()
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -1866,14 +1882,9 @@ mod tests {
     /// `EnchantRandomlyFunction`) put their enchantments on the stack.
     #[test]
     fn loot_enchant_functions_enchant_the_rolled_item() {
-        let root = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
-            .join("../../.local/horizon-client/26.3");
-        if !root.join("items.json").exists() {
+        let Some(items) = super::prepared_items() else {
             return;
-        }
-        let assets = crate::assets::Assets::load(&root).unwrap();
-        let facts = crate::blocks::BlockFacts::load(&root, assets.registry).unwrap();
-        let items = Items::load(&root, assets.registry, &facts).unwrap();
+        };
         let props = BTreeMap::new();
         let mut random = LegacyRandom::new(11);
         // A sword at levels 20..39 comes out enchanted, as in an End city.
@@ -1932,14 +1943,9 @@ mod tests {
     /// Mending book, then `set_count` uniform 1..64, is 46.
     #[test]
     fn a_single_level_enchantment_draws_no_level() {
-        let root = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
-            .join("../../.local/horizon-client/26.3");
-        if !root.join("items.json").exists() {
+        let Some(items) = super::prepared_items() else {
             return;
-        }
-        let assets = crate::assets::Assets::load(&root).unwrap();
-        let facts = crate::blocks::BlockFacts::load(&root, assets.registry).unwrap();
-        let items = Items::load(&root, assets.registry, &facts).unwrap();
+        };
         let props = BTreeMap::new();
         let table = json!({"pools":[{"rolls":1,"entries":[{"type":"minecraft:item",
             "name":"minecraft:book","modifier":[
@@ -1956,79 +1962,6 @@ mod tests {
         // 46 is vanilla's count for this seed; an extra level draw gives 28.
         assert_eq!(drops[0].count, 46);
     }
-
-    #[test]
-    fn always_edible_and_consume_effects_loaded() {
-        let root = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
-            .join("../../.local/horizon-client/26.3");
-        if !root.join("items.json").exists() {
-            return;
-        }
-        let assets = crate::assets::Assets::load(&root).unwrap();
-        let facts = crate::blocks::BlockFacts::load(&root, assets.registry).unwrap();
-        let items = Items::load(&root, assets.registry, &facts).unwrap();
-
-        let apple = items.get("minecraft:golden_apple").expect("golden apple");
-        assert!(apple.can_always_eat);
-        assert!(apple.food.is_some());
-        assert!(!apple.consumable.as_ref().unwrap().effects.is_empty());
-
-        let enchanted = items
-            .get("minecraft:enchanted_golden_apple")
-            .expect("enchanted golden apple");
-        assert!(enchanted.can_always_eat);
-        assert!(enchanted.food.is_some());
-        assert!(!enchanted.consumable.as_ref().unwrap().effects.is_empty());
-
-        let beef = items.get("minecraft:cooked_beef").expect("cooked beef");
-        assert!(!beef.can_always_eat);
-        assert!(beef.food.is_some());
-
-        // Consumables without food, their style and their remainders.
-        use horizon_world::consumable::UseAnimation;
-        let milk = items.get("minecraft:milk_bucket").expect("milk bucket");
-        let drink = milk.consumable.as_ref().unwrap();
-        assert!(milk.food.is_none());
-        assert_eq!(drink.effects, [ConsumeEffect::ClearAllEffects]);
-        assert_eq!((drink.ticks(), drink.animation), (32, UseAnimation::Drink));
-        assert_eq!(drink.sound, "minecraft:entity.generic.drink");
-        assert!(!drink.particles);
-        assert_eq!(milk.use_remainder.as_deref(), Some("minecraft:bucket"));
-        let honey = items.get("minecraft:honey_bottle").expect("honey bottle");
-        let sip = honey.consumable.as_ref().unwrap();
-        assert_eq!(sip.ticks(), 40);
-        assert_eq!(sip.sound, "minecraft:item.honey_bottle.drink");
-        assert_eq!(
-            sip.effects,
-            [ConsumeEffect::RemoveEffects(vec![
-                "minecraft:poison".into()
-            ])]
-        );
-        assert_eq!(
-            honey.use_remainder.as_deref(),
-            Some("minecraft:glass_bottle")
-        );
-        let kelp = items.get("minecraft:dried_kelp").unwrap();
-        let bite = kelp.consumable.as_ref().unwrap();
-        assert_eq!((bite.ticks(), bite.animation), (16, UseAnimation::Eat));
-        assert_eq!(bite.sound, "minecraft:entity.generic.eat");
-        assert!(bite.particles && kelp.use_remainder.is_none());
-        let chorus = items.get("minecraft:chorus_fruit").unwrap();
-        assert_eq!(
-            chorus.consumable.as_ref().unwrap().effects,
-            [ConsumeEffect::TeleportRandomly(
-                horizon_world::teleport_consume::TeleportConsume {
-                    diameter: 16.0,
-                    directional_particles: true,
-                }
-            )]
-        );
-        let chicken = items.get("minecraft:chicken").unwrap();
-        assert!(matches!(
-            chicken.consumable.as_ref().unwrap().effects[..],
-            [ConsumeEffect::ApplyEffects { probability, .. }] if probability == 0.3
-        ));
-    }
 }
 
 /// Minecraft.handleKeybinds: spectators cannot drop from the selected slot.
diff --git a/crates/horizon-items/src/lib.rs b/crates/horizon-items/src/lib.rs
new file mode 100644
index 000000000..6e05a7072
--- /dev/null
+++ b/crates/horizon-items/src/lib.rs
@@ -0,0 +1,19 @@
+//! Blocks and items as the client knows them, below gameplay: block facts
+//! (`blocks`), item stacks and definitions (`items`), their data components
+//! (`item_data`), enchantments, cooldowns, bundles and item stacks in NBT.
+//! horizon-client re-exports each module under its old path
+//! (`horizon_client::items`, ...).
+#![forbid(unsafe_code)]
+pub mod banner_layer;
+pub mod blocks;
+pub mod bundle;
+pub mod content_namespaces;
+pub mod cooldowns;
+pub mod enchant;
+pub mod firework;
+pub mod item_data;
+pub mod item_nbt;
+pub mod items;
+pub mod random_sequences;
+pub mod use_animation;
+pub use horizon_client_core::Result;
diff --git a/crates/horizon-client/src/random_sequences.rs b/crates/horizon-items/src/random_sequences.rs
similarity index 100%
rename from crates/horizon-client/src/random_sequences.rs
rename to crates/horizon-items/src/random_sequences.rs
diff --git a/crates/horizon-items/src/use_animation.rs b/crates/horizon-items/src/use_animation.rs
new file mode 100644
index 000000000..af7f66817
--- /dev/null
+++ b/crates/horizon-items/src/use_animation.rs
@@ -0,0 +1,14 @@
+//! The use animation a `consumable` component names.
+
+pub fn consumable_animation(v: &serde_json::Value) -> horizon_world::consumable::UseAnimation {
+    use horizon_world::consumable::UseAnimation;
+    match v
+        .get("animation")
+        .and_then(serde_json::Value::as_str)
+        .unwrap_or("eat")
+    {
+        "eat" => UseAnimation::Eat,
+        "drink" => UseAnimation::Drink,
+        _ => UseAnimation::None,
+    }
+}
diff --git a/docs/architecture.md b/docs/architecture.md
index 3aec2338b..9659800b3 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -5,7 +5,8 @@ counted only for the game loop because nearly every gameplay change touches it).
 organised and how to build and test are in [AGENTS.md](../AGENTS.md).
 
 Paths: `L/` = `crates/horizon-client/src/`, `G/` = `crates/horizon-client/src/game/`, `W/` =
-`crates/horizon-world/src/`, `K/` = `crates/horizon-client-core/src/`, `C/` = `crates/horizon-command/src/`.
+`crates/horizon-world/src/`, `K/` = `crates/horizon-client-core/src/`, `C/` = `crates/horizon-command/src/`,
+`I/` = `crates/horizon-items/src/`.
 Checks: a bare name is a harness (`python3 tools/parity.py <name>`, script `tools/test_<name>_parity.py`);
 `lan_e2e <check>` is `python3 tools/lan_e2e.py --check <check>`.
 
@@ -30,7 +31,7 @@ file selects ~103.
 | 12 | Guests' actions on a server (98) | `G/lan_actions.rs` (`fn as_guest`, `fn tick_guests`), `G/lan_{attributes,pvp,chat,crafting,stations,trading,mount_menu,waypoints}.rs` | server_player_combat, server_player_damage, server_player_targets, lan_e2e (all) |
 | 13 | Modpack porting, mod content (97) | `crates/horizon-port-pack/`, `L/mod_content.rs`, `tools/port_*.py` | `cargo test -p horizon-port-pack`; `python3 tools/mod_port_harness.py` |
 | 14 | Mob AI (96) | `L/mobs/ai.rs`, `goals.rs`, `brain.rs`, `*_brain.rs`, `nav.rs`, `path.rs`, `control.rs` | mob_ai (probe `examples/mob_ai_probe.rs`; known failure on main: drowned_*, #290) |
-| 15 | Items and item use (96) | `L/items.rs`, `L/item_data.rs`, `G/hand.rs`, `G/consume.rs`, `G/potions.rs`, `L/effects.rs`; game.rs `fn use_hand`, `fn use_item` | use_item_on, item_use, item_use_lifecycle, consumable, consume_effect, status_effect |
+| 15 | Items and item use (96) | `I/items.rs`, `I/item_data.rs`, `G/hand.rs`, `G/consume.rs`, `G/potions.rs`, `L/effects.rs`; game.rs `fn use_hand`, `fn use_item` | use_item_on, item_use, item_use_lifecycle, consumable, consume_effect, status_effect |
 | 16 | Options and settings screens (93) | `L/options_ui.rs`, `G/options.rs`, `L/settings.rs`, `L/options_file.rs`, `L/graphics_ui.rs`, `L/graphics.rs` | options, toggle_keys |
 | 17 | HUD, chat, tab list (93) | `L/hud.rs`, `L/hud_layout.rs`, `L/hud_overlays.rs`, `L/chat.rs`, `G/chat.rs`, `L/tab_list.rs`, `L/locator_bar.rs`, `G/locator_bar.rs` | hud, tab_list, locator_bar, chat_screen, secure_chat |
 | 18 | Command execution (88) | `G/commands.rs`, `G/commands/*.rs`, `L/scoreboard_cmd.rs`, `L/data_cmd.rs`, `K/scoreboard.rs`, `G/functions.rs` | command_exec (corpus `tools/command_exec_corpus.py`), scoreboard, server_ops_feedback, lan_e2e commands |
@@ -40,7 +41,7 @@ file selects ~103.
 | 22 | Player movement and collision (75) | `L/motion.rs` + `L/motion/`, `L/collisions.rs`, `W/entity_move.rs`, `W/player_travel.rs`, `W/collision.rs` | collision, entity_move, player_travel, living_motion, climbing, swimming; `python3 tools/test_native_scene_motion.py` |
 | 23 | Resource packs and models (65) | `L/packs.rs` + `L/packs/`, `L/pack_screen.rs`, `L/atlas_sources.rs`, `L/sprites.rs`, `L/model_library.rs`, `G/packs.rs`, `crates/horizon-assets/` | resource_pack, pack_selection, pack_screen, model_resolution, item_model, mipmap |
 | 24 | Container menus and inventory (61) | `L/menu.rs`, `L/container_screen.rs`, `L/containers.rs`, `L/creative.rs`; game.rs `fn menu_ops`, `fn click_inventory` | menu_click, container_screen, creative, lan_e2e containers clicks |
-| 25 | Workstations (60) | `L/stations.rs`, `G/stations.rs`, `L/enchant.rs`, `L/brewing.rs` | enchanting, screen_layout, lan_e2e brewing loom stonecutter grindstone anvil smithing |
+| 25 | Workstations (60) | `L/stations.rs`, `G/stations.rs`, `I/enchant.rs`, `L/brewing.rs` | enchanting, screen_layout, lan_e2e brewing loom stonecutter grindstone anvil smithing |
 | 26 | Crafting and the recipe book (59) | `L/crafting.rs`, `L/recipe_book.rs`, `L/recipe_book_screen.rs`, `G/recipe_book.rs`, `G/machines.rs`, `G/machines/crafter.rs` | recipe, recipe_book, recipe_book_view, place_recipe, ghost_recipe, crafter |
 | 27 | Vehicles and mounts (54) | `G/boats.rs`, `G/boat_passengers.rs`, `G/minecarts.rs`, `G/mounts.rs`, `G/mount_menu.rs`, `G/llamas.rs`, `G/passengers.rs` | server_entities, lan_e2e boats minecarts riding mounts |
 | 28 | Villagers, trading, raids (50) | `L/mobs/villager*.rs`, `L/merchant.rs`, `G/trading.rs`, `G/villagers.rs`, `L/raid.rs`, `G/raids.rs`, `L/gossip.rs` | trading, raid, mob_ai |
diff --git a/docs/release-flow.md b/docs/release-flow.md
index 5377b27bc..09565bd2e 100644
--- a/docs/release-flow.md
+++ b/docs/release-flow.md
@@ -447,6 +447,9 @@ comment on any issue or pull request (`.github/workflows/nightly-command.yml`, `
   Equal inputs give the same commit, so an unchanged set and main publish nothing new. On a conflict the build
   stops and answers which two pull requests conflict and where; a reviewer can then open an integration pull
   request from their fork that combines them, and pick that one instead.
+- **Old builds.** The scheduled run deletes the `nightly/build-*` branches older than 7 days (Ludovic,
+  2026-10-27), and lists each in its summary. It never deletes the newest build, a build a published `nightly` or
+  `nightly-<date>` release points to, or any other branch (`nightly.py prune-builds`).
 - **Refused.** A pull request that changes a path CODEOWNERS gives to Ludovic (`.github/`, `tools/ci/`, the
   signing and update code, `launcher/src/backend.rs`, `launcher/links.json`…), more than 30 in a set, and more than
   6 builds a day (the scheduled one always runs).
diff --git a/tests/test_nightly.py b/tests/test_nightly.py
index c44416044..567b3d86e 100644
--- a/tests/test_nightly.py
+++ b/tests/test_nightly.py
@@ -120,3 +120,39 @@ class UntrustedBuildTests(unittest.TestCase):
         self.assertEqual(self.game.count("HORIZON_NO_SCCACHE: ${{ inputs.trusted && '1' || '' }}"), calls)
         env = (Path(__file__).resolve().parents[1] / "tools/ci/runner-env.sh").read_text()
         self.assertEqual(env.count('-z "${HORIZON_NO_SCCACHE:-}"'), 2)
+
+
+class PruneBuildsTests(unittest.TestCase):
+    TODAY = dt.date(2026, 11, 10)
+
+    def test_only_old_unpublished_builds_go(self):
+        branches = {
+            "nightly/build-2026-10-27-1": "a",   # old: goes
+            "nightly/build-2026-10-27-2": "pub",  # old, but a published nightly-<date> points to it: stays
+            "nightly/build-2026-11-02-1": "c",   # old enough by one day: goes
+            "nightly/build-2026-11-03-1": "d",   # exactly 7 days: stays
+            "nightly/build-2026-11-09-3": "e",   # recent: stays
+        }
+        self.assertEqual(nightly.stale_builds(branches, {"pub"}, self.TODAY, 7),
+                         ["nightly/build-2026-10-27-1", "nightly/build-2026-11-02-1"])
+
+    def test_the_newest_build_always_stays(self):
+        branches = {"nightly/build-2026-10-01-1": "a", "nightly/build-2026-10-01-2": "b"}
+        self.assertEqual(nightly.stale_builds(branches, set(), self.TODAY, 7), ["nightly/build-2026-10-01-1"])
+        self.assertEqual(nightly.stale_builds({"nightly/build-2026-10-01-1": "a"}, set(), self.TODAY, 7), [])
+        # the newest by number, not by text: -10 is newer than -9
+        branches = {"nightly/build-2026-10-01-9": "a", "nightly/build-2026-10-01-10": "b"}
+        self.assertEqual(nightly.stale_builds(branches, set(), self.TODAY, 7), ["nightly/build-2026-10-01-9"])
+
+    def test_nothing_else_is_touched(self):
+        branches = {"nightly-state": "s", "nightly/build-x": "x", "main": "m", "nightly/build-2026-10-01-1-fix": "f",
+                    "feature/nightly/build-2026-10-01-1": "g", "nightly/build-2026-10-02-1": "n"}
+        self.assertEqual(nightly.stale_builds(branches, set(), self.TODAY, 7), [])
+
+    def test_the_workflow_prunes_on_schedule_only(self):
+        build = (WORKFLOWS / "nightly-build.yml").read_text()
+        step = build.split("Old nightly/build-* branches deleted", 1)[1].split("- uses:", 1)[0]
+        self.assertIn("if: github.event_name == 'schedule'", step)
+        self.assertIn("prune-builds --days 7", step)
+        self.assertIn("GITHUB_STEP_SUMMARY", step)
+
diff --git a/tools/ci/nightly.py b/tools/ci/nightly.py
index 9a6dd8a3b..e04b99ddd 100644
--- a/tools/ci/nightly.py
+++ b/tools/ci/nightly.py
@@ -4,6 +4,8 @@
     nightly.py pick [--force]      which commit tonight's nightly builds: GitHub outputs and nightly-notes.md
     nightly.py rotate              renames the current `nightly` pre-release to nightly-<its date>, frees the tag
     nightly.py prune [--days 7]    deletes the nightly-<date> pre-releases and tags older than that, nothing else
+    nightly.py prune-builds [--days 7]   deletes the nightly/build-<date>-<n> branches older than that, but the
+                                   newest and any a published nightly points to (Ludovic, 2026-10-27)
 
 A nightly builds main plus the pull requests the trusted reviewers picked (the set: tools/ci/nightly_set.py), merged
 in their order and pushed as nightly/build-<date>-<n>. With no set it builds the newest union branch on origin
@@ -264,17 +266,63 @@ def prune(days: int) -> None:
         print(f"deleted {tag}")
 
 
+BUILD = re.compile(r"^nightly/build-(\d{4}-\d{2}-\d{2})-(\d+)$")
+
+
+def stale_builds(branches: dict[str, str], published: set[str], today: dt.date, days: int) -> list[str]:
+    """The nightly/build-<date>-<n> branches (name -> commit) to delete: older than `days`, never the newest build,
+    never one whose commit a published nightly release points to, never a branch not named like a build."""
+    builds = {name: sha for name, sha in branches.items() if BUILD.match(name)}
+    if not builds:
+        return []
+    order = lambda name: (BUILD.match(name).group(1), int(BUILD.match(name).group(2)))  # noqa: E731
+    newest = max(builds, key=order)
+    cutoff = today - dt.timedelta(days=days)
+    return sorted(name for name, sha in builds.items() if name != newest and sha not in published
+                  and dt.date.fromisoformat(BUILD.match(name).group(1)) < cutoff)
+
+
+def remote_refs(pattern: str) -> dict[str, str]:
+    """origin's refs matching `pattern`: short name -> commit (annotated tags peeled)."""
+    refs: dict[str, str] = {}
+    for line in git("ls-remote", "origin", pattern).splitlines():
+        sha, ref = line.split("\t", 1)
+        name = ref.removeprefix("refs/heads/").removeprefix("refs/tags/")
+        if name.endswith("^{}"):
+            refs[name[:-3]] = sha  # the peeled commit wins over the tag object
+        else:
+            refs.setdefault(name, sha)
+    return refs
+
+
+def prune_builds(days: int) -> None:
+    """Deletes old nightly/build-* branches on origin through the API, one line per deletion (the run summary)."""
+    branches = remote_refs("refs/heads/nightly/build-*")
+    tags = {name: sha for name, sha in remote_refs("refs/tags/nightly*").items()
+            if name == "nightly" or DATED.match(name)}
+    today = dt.datetime.now(dt.timezone.utc).date()
+    doomed = stale_builds(branches, set(tags.values()), today, days)
+    for name in doomed:
+        gh("api", "-X", "DELETE", f"repos/{os.environ['GITHUB_REPOSITORY']}/git/refs/heads/{name}")
+        print(f"- deleted `{name}` ({branches[name][:7]})")
+    print(f"{len(doomed)} of {len(branches)} nightly/build-* branches deleted (kept: the newest, the published "
+          f"nightlies' and the last {days} days')")
+
+
 def main() -> None:
     ap = argparse.ArgumentParser(description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter)
     sub = ap.add_subparsers(dest="cmd", required=True)
     sub.add_parser("pick").add_argument("--force", action="store_true")
     sub.add_parser("rotate")
     sub.add_parser("prune").add_argument("--days", type=int, default=7)
+    sub.add_parser("prune-builds").add_argument("--days", type=int, default=7)
     args = ap.parse_args()
     if args.cmd == "pick":
         pick(args.force)
     elif args.cmd == "rotate":
         rotate()
+    elif args.cmd == "prune-builds":
+        prune_builds(args.days)
     else:
         prune(args.days)
 
diff --git a/tools/pr_ready.py b/tools/pr_ready.py
index b741e475e..d4b97023f 100755
--- a/tools/pr_ready.py
+++ b/tools/pr_ready.py
@@ -292,8 +292,7 @@ def mod_features(crates):
 
 # What horizon-client's full content-root tests load (mod_content_tests.rs). They take minutes on prepared data, so
 # they are #[ignore]d and run here only when one of these changes.
-CONTENT_ROOT = ("crates/horizon-client/src/mod_content", "crates/horizon-client/src/assets.rs",
-                "crates/horizon-client/src/blocks.rs", "crates/horizon-client/src/items.rs", "crates/horizon-items/",
+CONTENT_ROOT = ("crates/horizon-client/src/mod_content", "crates/horizon-client/src/assets.rs", "crates/horizon-items/",
                 "crates/horizon-mods/", "crates/horizon-assets/")
 CONTENT_ROOT_TESTS = "cargo test --locked -p horizon-client --features horizon-client/mods --lib mod_content::tests:: -- --ignored"
 
diff --git a/tools/test_block_particles_parity.py b/tools/test_block_particles_parity.py
index 7e08e98f8..ff50bd745 100644
--- a/tools/test_block_particles_parity.py
+++ b/tools/test_block_particles_parity.py
@@ -13,7 +13,7 @@ def main():
     resources = lab.RESOURCES
     build = lab.LOCAL / "block-particles-parity"
     build.mkdir(exist_ok=True)
-    paths = [lab.ROOT / p for p in ["tools/test_block_particles_parity.py", "tools/test_breaking_model_parity.py", "tools/oracle_harness.py", "tools/lab.py", "crates/horizon-client/src/particles.rs", "crates/horizon-client/src/game.rs", "crates/horizon-client/src/blocks.rs", "crates/horizon-client/src/mesher.rs", "crates/horizon-client/examples/probe/block_particles_fixture.rs", "mods/horizon/src/test/java/dev/horizonlab/parity/VanillaBlockParticlesOracle.java", "crates/horizon-core/src/random.rs", "Cargo.lock", "mods/horizon/src/test/java/dev/horizonlab/parity/VanillaGameplayFactsExporter.java"]]
+    paths = [lab.ROOT / p for p in ["tools/test_block_particles_parity.py", "tools/test_breaking_model_parity.py", "tools/oracle_harness.py", "tools/lab.py", "crates/horizon-client/src/particles.rs", "crates/horizon-client/src/game.rs", "crates/horizon-items/src/blocks.rs", "crates/horizon-client/src/mesher.rs", "crates/horizon-client/examples/probe/block_particles_fixture.rs", "mods/horizon/src/test/java/dev/horizonlab/parity/VanillaBlockParticlesOracle.java", "crates/horizon-core/src/random.rs", "Cargo.lock", "mods/horizon/src/test/java/dev/horizonlab/parity/VanillaGameplayFactsExporter.java"]]
     tested = base.source_hashes(paths)
     rows = [dict(case=i, seed=(-1 if i % 2 else 1) * i * 987654321, **row) for i, row in enumerate(breaking.cases(resources))]
     rows[0]["seed"] = -(2**63)
diff --git a/tools/test_creative_mining_parity.py b/tools/test_creative_mining_parity.py
index 3e6bfed1a..03a3de34e 100644
--- a/tools/test_creative_mining_parity.py
+++ b/tools/test_creative_mining_parity.py
@@ -28,7 +28,7 @@ def main():
         'Item.canDestroyBlock with each vanilla item, empty stacks, Survival/Creative '
         'abilities, and explicit/implicit tool overrides. Block destruction and network '
         'prediction call this predicate; end-to-end packet handling is not covered here.',
-        sources=[lab.ROOT / 'crates/horizon-client/src/items.rs'])
+        sources=[lab.ROOT / 'crates/horizon-items/src/items.rs'])
 
 
 if __name__ == '__main__':
diff --git a/tools/test_fire_starter_sound_parity.py b/tools/test_fire_starter_sound_parity.py
index bac04f4aa..b8b0696c1 100644
--- a/tools/test_fire_starter_sound_parity.py
+++ b/tools/test_fire_starter_sound_parity.py
@@ -25,7 +25,7 @@ def main():
              'FireChargeItem.useOn\'s choice between lighting and placing fire is not exercised.')
     harness.differential(
         'rust-fire-starter-sound-parity', 'VanillaFireStarterSoundOracle', 'fire_starter_sound_probe', make_cases,
-        scope, sources=[lab.ROOT / 'crates/horizon-client/src/items.rs'])
+        scope, sources=[lab.ROOT / 'crates/horizon-items/src/items.rs'])
 
 
 if __name__ == '__main__':
diff --git a/tools/test_firework_tooltip_parity.py b/tools/test_firework_tooltip_parity.py
index 14a4138b5..5e971d8db 100644
--- a/tools/test_firework_tooltip_parity.py
+++ b/tools/test_firework_tooltip_parity.py
@@ -67,7 +67,7 @@ if __name__ == '__main__':
         'firework-tooltip-parity', 'VanillaFireworkTooltipOracle', 'firework_tooltip_fixture', cases,
         'Firework rocket and star tooltip lines: flight duration, explosions (counted runs), colours, fade, trail, '
         'twinkle, defaults and tooltip_display',
-        sources=[lab.ROOT / 'crates/horizon-client/src/enchant.rs',
-                 lab.ROOT / 'crates/horizon-client/src/item_tooltip.rs', lab.ROOT / 'crates/horizon-client/src/item_data.rs',
+        sources=[lab.ROOT / 'crates/horizon-items/src/enchant.rs',
+                 lab.ROOT / 'crates/horizon-client/src/item_tooltip.rs', lab.ROOT / 'crates/horizon-items/src/item_data.rs',
                  lab.ROOT / 'crates/horizon-client/src/particles.rs'],
         expected_lines=COUNT)
diff --git a/tools/test_lore_tooltip_parity.py b/tools/test_lore_tooltip_parity.py
index e6869f7e9..63f746392 100644
--- a/tools/test_lore_tooltip_parity.py
+++ b/tools/test_lore_tooltip_parity.py
@@ -34,7 +34,7 @@ if __name__ == '__main__':
         'Item lore tooltip lines: dark purple italic, child colours, explicit non-italic, and tooltip_display',
         sources=[
             lab.ROOT / 'crates/horizon-client/src/item_tooltip.rs',
-            lab.ROOT / 'crates/horizon-client/src/item_data.rs',
+            lab.ROOT / 'crates/horizon-items/src/item_data.rs',
             lab.ROOT / 'crates/horizon-client-core/src/text.rs',
             lab.ROOT / 'crates/horizon-client-core/src/component.rs',
         ],