diff --git a/assets/common/cave_scatter.ron b/assets/common/cave_scatter.ron
new file mode 100644
index 0000000000..d45653c98e
--- /dev/null
+++ b/assets/common/cave_scatter.ron
@@ -0,0 +1,10 @@
+[
+    (25, Velorite),
+    (50, VeloriteFrag),
+    (15, WhiteFlower),
+    (80, ShortGrass),
+    (150, Mushroom),
+    (5, Chest),
+    (2, Crate),
+    (1, Scarecrow),
+]
diff --git a/common/src/comp/inventory/item/mod.rs b/common/src/comp/inventory/item/mod.rs
index 3990e1c5d7..4ea11edd80 100644
--- a/common/src/comp/inventory/item/mod.rs
+++ b/common/src/comp/inventory/item/mod.rs
@@ -1,5 +1,4 @@
 pub mod armor;
-pub mod lottery;
 pub mod tool;
 
 // Reexports
@@ -9,6 +8,7 @@ use crate::{
     assets::{self, Asset},
     effect::Effect,
     terrain::{Block, BlockKind},
+    lottery::Lottery,
 };
 use serde::{Deserialize, Serialize};
 use specs::{Component, FlaggedStorage};
@@ -161,7 +161,7 @@ impl Item {
             BlockKind::ShortGrass => Some(assets::load_expect_cloned("common.items.grasses.short")),
             BlockKind::Coconut => Some(assets::load_expect_cloned("common.items.food.coconut")),
             BlockKind::Chest => {
-                let chosen = assets::load_expect::<lottery::Lottery<_>>("common.loot_table");
+                let chosen = assets::load_expect::<Lottery<String>>("common.loot_table");
                 let chosen = chosen.choose();
 
                 Some(assets::load_expect_cloned(chosen))
diff --git a/common/src/lib.rs b/common/src/lib.rs
index 3bddacde79..6f0632e0b6 100644
--- a/common/src/lib.rs
+++ b/common/src/lib.rs
@@ -39,5 +39,6 @@ pub mod terrain;
 pub mod util;
 pub mod vol;
 pub mod volumes;
+pub mod lottery;
 
 pub use loadout_builder::LoadoutBuilder;
diff --git a/common/src/comp/inventory/item/lottery.rs b/common/src/lottery.rs
similarity index 81%
rename from common/src/comp/inventory/item/lottery.rs
rename to common/src/lottery.rs
index 6cbeed52d7..13b5ff8142 100644
--- a/common/src/comp/inventory/item/lottery.rs
+++ b/common/src/lottery.rs
@@ -1,25 +1,19 @@
 use crate::assets::{self, Asset};
 use rand::prelude::*;
-use serde::{Deserialize, Serialize};
+use serde::{Deserialize, Serialize, de::DeserializeOwned};
 use std::{fs::File, io::BufReader};
 
-// Generate a random float between 0 and 1
-pub fn rand() -> f32 {
-    let mut rng = rand::thread_rng();
-    rng.gen()
-}
-
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 pub struct Lottery<T> {
     items: Vec<(f32, T)>,
     total: f32,
 }
 
-impl Asset for Lottery<String> {
+impl<T: DeserializeOwned + Send + Sync> Asset for Lottery<T> {
     const ENDINGS: &'static [&'static str] = &["ron"];
 
     fn parse(buf_reader: BufReader<File>) -> Result<Self, assets::Error> {
-        ron::de::from_reader::<BufReader<File>, Vec<(f32, String)>>(buf_reader)
+        ron::de::from_reader::<BufReader<File>, Vec<(f32, T)>>(buf_reader)
             .map(|items| Lottery::from_rates(items.into_iter()))
             .map_err(assets::Error::parse_error)
     }
@@ -37,8 +31,8 @@ impl<T> Lottery<T> {
         Self { items, total }
     }
 
-    pub fn choose(&self) -> &T {
-        let x = rand() * self.total;
+    pub fn choose_seeded(&self, seed: u32) -> &T {
+        let x = ((seed % 65536) as f32 / 65536.0) * self.total;
         &self.items[self
             .items
             .binary_search_by(|(y, _)| y.partial_cmp(&x).unwrap())
@@ -46,6 +40,10 @@ impl<T> Lottery<T> {
         .1
     }
 
+    pub fn choose(&self) -> &T {
+        self.choose_seeded(thread_rng().gen())
+    }
+
     pub fn iter(&self) -> impl Iterator<Item = &(f32, T)> { self.items.iter() }
 }
 
diff --git a/server/src/events/entity_manipulation.rs b/server/src/events/entity_manipulation.rs
index ff6f4ae2b6..852b8317bc 100644
--- a/server/src/events/entity_manipulation.rs
+++ b/server/src/events/entity_manipulation.rs
@@ -2,7 +2,7 @@ use crate::{client::Client, Server, SpawnPoint, StateExt};
 use common::{
     assets,
     comp::{
-        self, item::lottery::Lottery, object, Alignment, Body, Damage, DamageSource, Group,
+        self, object, Alignment, Body, Damage, DamageSource, Group,
         HealthChange, HealthSource, Player, Pos, Stats,
     },
     msg::{PlayerListUpdate, ServerMsg},
@@ -12,6 +12,7 @@ use common::{
     sys::combat::BLOCK_ANGLE,
     terrain::{Block, TerrainGrid},
     vol::{ReadVol, Vox},
+    lottery::Lottery,
 };
 use specs::{join::Join, saveload::MarkerAllocator, Entity as EcsEntity, WorldExt};
 use tracing::error;
@@ -182,7 +183,7 @@ pub fn handle_destroy(server: &mut Server, entity: EcsEntity, cause: HealthSourc
             item_drops.remove(entity);
             item_drop.0
         } else {
-            let chosen = assets::load_expect::<Lottery<_>>("common.loot_table");
+            let chosen = assets::load_expect::<Lottery<String>>("common.loot_table");
             let chosen = chosen.choose();
 
             assets::load_expect_cloned(chosen)
diff --git a/world/src/block/mod.rs b/world/src/block/mod.rs
index 4edef6b8d4..323450661f 100644
--- a/world/src/block/mod.rs
+++ b/world/src/block/mod.rs
@@ -164,8 +164,6 @@ impl<'a> BlockGen<'a> {
             //tree_density,
             //forest_kind,
             //close_structures,
-            cave_xy,
-            cave_alt,
             marble,
             marble_small,
             rock,
@@ -370,23 +368,6 @@ impl<'a> BlockGen<'a> {
                     None
                 }
             })
-            .and_then(|block| {
-                // Caves
-                // Underground
-                let cave = cave_xy.powf(2.0)
-                    * (wposf.z as f32 - cave_alt)
-                        .div(40.0)
-                        .powf(4.0)
-                        .neg()
-                        .add(1.0)
-                    > 0.9993;
-
-                if cave && wposf.z as f32 > water_height + 3.0 {
-                    None
-                } else {
-                    Some(block)
-                }
-            })
             .or_else(|| {
                 // Water
                 if (wposf.z as f32) < water_height {
@@ -422,14 +403,7 @@ pub struct ZCache<'a> {
 
 impl<'a> ZCache<'a> {
     pub fn get_z_limits(&self, block_gen: &mut BlockGen, index: &Index) -> (f32, f32, f32) {
-        let cave_depth =
-            if self.sample.cave_xy.abs() > 0.9 && self.sample.water_level <= self.sample.alt {
-                (self.sample.alt - self.sample.cave_alt + 8.0).max(0.0)
-            } else {
-                0.0
-            };
-
-        let min = self.sample.alt - (self.sample.chaos.min(1.0) * 16.0 + cave_depth);
+        let min = self.sample.alt - (self.sample.chaos.min(1.0) * 16.0);
         let min = min - 4.0;
 
         let cliff = BlockGen::get_cliff_height(
diff --git a/world/src/civ/mod.rs b/world/src/civ/mod.rs
index 96ff4c98f9..53888f46de 100644
--- a/world/src/civ/mod.rs
+++ b/world/src/civ/mod.rs
@@ -214,7 +214,8 @@ impl Civs {
 
     // TODO: Move this
     fn generate_cave(&self, ctx: &mut GenCtx<impl Rng>) {
-        let mut pos = ctx.sim
+        let mut pos = ctx
+            .sim
             .get_size()
             .map(|sz| ctx.rng.gen_range(0, sz as i32) as f32);
         let mut vel = pos
@@ -225,14 +226,16 @@ impl Civs {
         let path = (-100..100)
             .filter_map(|i: i32| {
                 let depth = (i.abs() as f32 / 100.0 * std::f32::consts::PI / 2.0).cos();
-                vel = (vel + Vec2::new(
-                    ctx.rng.gen_range(-0.25, 0.25),
-                    ctx.rng.gen_range(-0.25, 0.25),
-                ))
-                    .try_normalized()
-                    .unwrap_or_else(Vec2::unit_y);
+                vel = (vel
+                    + Vec2::new(
+                        ctx.rng.gen_range(-0.35, 0.35),
+                        ctx.rng.gen_range(-0.35, 0.35),
+                    ))
+                .try_normalized()
+                .unwrap_or_else(Vec2::unit_y);
                 let old_pos = pos.map(|e| e as i32);
-                pos = (pos + vel * 0.5).clamped(Vec2::zero(), ctx.sim.get_size().map(|e| e as f32 - 1.0));
+                pos = (pos + vel * 0.5)
+                    .clamped(Vec2::zero(), ctx.sim.get_size().map(|e| e as f32 - 1.0));
                 Some((pos.map(|e| e as i32), depth)).filter(|(pos, _)| *pos != old_pos)
             })
             .collect::<Vec<_>>();
@@ -256,15 +259,12 @@ impl Civs {
             ctx.sim.get_mut(locs[2].0).unwrap().cave.0.neighbors |=
                 1 << ((to_next_idx as u8 + 4) % 8);
             let mut chunk = ctx.sim.get_mut(locs[1].0).unwrap();
-            chunk.cave.0.neighbors |=
-                (1 << (to_prev_idx as u8)) | (1 << (to_next_idx as u8));
-            let depth = locs[1].1 * 250.0;
-            chunk.cave.1.alt = chunk.alt - depth + ctx.rng.gen_range(-4.0, 4.0) * (depth > 10.0) as i32 as f32;
-            chunk.cave.1.width = ctx.rng.gen_range(12.0, 32.0);
-            chunk.cave.0.offset = Vec2::new(
-                ctx.rng.gen_range(-16, 17),
-                ctx.rng.gen_range(-16, 17),
-            );
+            chunk.cave.0.neighbors |= (1 << (to_prev_idx as u8)) | (1 << (to_next_idx as u8));
+            let depth = locs[1].1 * 250.0 - 20.0;
+            chunk.cave.1.alt =
+                chunk.alt - depth + ctx.rng.gen_range(-4.0, 4.0) * (depth > 10.0) as i32 as f32;
+            chunk.cave.1.width = ctx.rng.gen_range(6.0, 32.0);
+            chunk.cave.0.offset = Vec2::new(ctx.rng.gen_range(-16, 17), ctx.rng.gen_range(-16, 17));
         }
     }
 
@@ -492,10 +492,8 @@ impl Civs {
                             let mut chunk = ctx.sim.get_mut(locs[1]).unwrap();
                             chunk.path.0.neighbors |=
                                 (1 << (to_prev_idx as u8)) | (1 << (to_next_idx as u8));
-                            chunk.path.0.offset = Vec2::new(
-                                ctx.rng.gen_range(-16, 17),
-                                ctx.rng.gen_range(-16, 17),
-                            );
+                            chunk.path.0.offset =
+                                Vec2::new(ctx.rng.gen_range(-16, 17), ctx.rng.gen_range(-16, 17));
                         }
 
                         // Take note of the track
diff --git a/world/src/column/mod.rs b/world/src/column/mod.rs
index 7a1cdc72af..47c28a3bab 100644
--- a/world/src/column/mod.rs
+++ b/world/src/column/mod.rs
@@ -2,8 +2,8 @@ use crate::{
     all::ForestKind,
     block::StructureMeta,
     sim::{
-        local_cells, uniform_idx_as_vec2, vec2_as_uniform_idx,
-        Path, Cave, RiverKind, SimChunk, WorldSim,
+        local_cells, uniform_idx_as_vec2, vec2_as_uniform_idx, Cave, Path, RiverKind, SimChunk,
+        WorldSim,
     },
     util::Sampler,
     Index, CONFIG,
@@ -1038,34 +1038,6 @@ where
             (alt, ground, sub_surface_color)
         };
 
-        // Caves
-        let cave_at = |wposf: Vec2<f64>| {
-            (sim.gen_ctx.cave_0_nz.get(
-                Vec3::new(wposf.x, wposf.y, alt as f64 * 8.0)
-                    .div(800.0)
-                    .into_array(),
-            ) as f32)
-                .powf(2.0)
-                .neg()
-                .add(1.0)
-                .mul((1.32 - chaos).min(1.0))
-        };
-        let cave_xy = cave_at(wposf);
-        let cave_alt = alt - 24.0
-            + (sim
-                .gen_ctx
-                .cave_1_nz
-                .get(Vec2::new(wposf.x, wposf.y).div(48.0).into_array()) as f32)
-                * 8.0
-            + (sim
-                .gen_ctx
-                .cave_1_nz
-                .get(Vec2::new(wposf.x, wposf.y).div(500.0).into_array()) as f32)
-                .add(1.0)
-                .mul(0.5)
-                .powf(15.0)
-                .mul(150.0);
-
         let near_ocean = max_river.and_then(|(_, _, river_data, _)| {
             if (river_data.is_lake() || river_data.river_kind == Some(RiverKind::Ocean))
                 && ((alt <= water_level.max(CONFIG.sea_level + 5.0) && !is_cliffs) || !near_cliffs)
@@ -1118,8 +1090,6 @@ where
             },
             forest_kind: sim_chunk.forest_kind,
             close_structures: self.gen_close_structures(wpos),
-            cave_xy,
-            cave_alt,
             marble,
             marble_small,
             rock,
@@ -1153,8 +1123,6 @@ pub struct ColumnSample<'a> {
     pub tree_density: f32,
     pub forest_kind: ForestKind,
     pub close_structures: [Option<StructureData>; 9],
-    pub cave_xy: f32,
-    pub cave_alt: f32,
     pub marble: f32,
     pub marble_small: f32,
     pub rock: f32,
diff --git a/world/src/index.rs b/world/src/index.rs
index 242cbf3dcc..e181e0ed68 100644
--- a/world/src/index.rs
+++ b/world/src/index.rs
@@ -3,6 +3,16 @@ use common::store::{Id, Store};
 
 #[derive(Default)]
 pub struct Index {
+    pub seed: u32,
     pub time: f32,
     pub sites: Store<Site>,
 }
+
+impl Index {
+    pub fn new(seed: u32) -> Self {
+        Self {
+            seed,
+            ..Self::default()
+        }
+    }
+}
diff --git a/world/src/layer/mod.rs b/world/src/layer/mod.rs
index 565a89b9b5..612b5ca9cc 100644
--- a/world/src/layer/mod.rs
+++ b/world/src/layer/mod.rs
@@ -1,10 +1,13 @@
 use crate::{
     column::ColumnSample,
     util::{RandomField, Sampler},
+    Index,
 };
 use common::{
     terrain::{Block, BlockKind},
     vol::{BaseVol, ReadVol, RectSizedVol, Vox, WriteVol},
+    lottery::Lottery,
+    assets,
 };
 use std::f32;
 use vek::*;
@@ -13,6 +16,7 @@ pub fn apply_paths_to<'a>(
     wpos2d: Vec2<i32>,
     mut get_column: impl FnMut(Vec2<i32>) -> Option<&'a ColumnSample<'a>>,
     vol: &mut (impl BaseVol<Vox = Block> + RectSizedVol + ReadVol + WriteVol),
+    index: &Index,
 ) {
     for y in 0..vol.size_xy().y as i32 {
         for x in 0..vol.size_xy().x as i32 {
@@ -100,6 +104,7 @@ pub fn apply_caves_to<'a>(
     wpos2d: Vec2<i32>,
     mut get_column: impl FnMut(Vec2<i32>) -> Option<&'a ColumnSample<'a>>,
     vol: &mut (impl BaseVol<Vox = Block> + RectSizedVol + ReadVol + WriteVol),
+    index: &Index,
 ) {
     for y in 0..vol.size_xy().y as i32 {
         for x in 0..vol.size_xy().x as i32 {
@@ -120,14 +125,26 @@ pub fn apply_caves_to<'a>(
                 .filter(|(dist, _, cave, _)| *dist < cave.width)
             {
                 let cave_x = (cave_dist / cave.width).min(1.0);
-                let height = (1.0 - cave_x.powf(2.0)).max(0.0).sqrt() * cave.width;
 
-                for z in (cave.alt - height) as i32..(cave.alt + height) as i32 {
-                    let _ = vol.set(
-                        Vec3::new(offs.x, offs.y, z),
-                        Block::empty(),
-                    );
+                // Relative units
+                let cave_floor = 0.0 - 0.5 * (1.0 - cave_x.powf(2.0)).max(0.0).sqrt() * cave.width;
+                let cave_height = (1.0 - cave_x.powf(2.0)).max(0.0).sqrt() * cave.width;
+
+                // Abs units
+                let cave_base = (cave.alt + cave_floor) as i32;
+                let cave_roof = (cave.alt + cave_height) as i32;
+
+                for z in cave_base..cave_roof {
+                    let _ = vol.set(Vec3::new(offs.x, offs.y, z), Block::empty());
                 }
+
+                // Scatter things in caves
+                if RandomField::new(index.seed).chance(wpos2d.into(), 0.002) && cave_base < surface_z as i32 - 25 {
+                    let kind = *assets::load_expect::<Lottery<BlockKind>>("common.cave_scatter")
+                        .choose_seeded(RandomField::new(index.seed + 1).get(wpos2d.into()));
+                    let _ = vol.set(Vec3::new(offs.x, offs.y, cave_base), Block::new(kind, Rgb::zero()));
+                }
+
             }
         }
     }
diff --git a/world/src/lib.rs b/world/src/lib.rs
index 96d8865da2..d36576595b 100644
--- a/world/src/lib.rs
+++ b/world/src/lib.rs
@@ -48,7 +48,7 @@ pub struct World {
 impl World {
     pub fn generate(seed: u32, opts: sim::WorldOpts) -> Self {
         let mut sim = sim::WorldSim::generate(seed, opts);
-        let mut index = Index::default();
+        let mut index = Index::new(seed);
         let civs = civ::Civs::generate(seed, &mut sim, &mut index);
 
         sim2::simulate(&mut index, &mut sim);
@@ -176,8 +176,8 @@ impl World {
         let mut rng = rand::thread_rng();
 
         // Apply layers (paths, caves, etc.)
-        layer::apply_paths_to(chunk_wpos2d, sample_get, &mut chunk);
-        layer::apply_caves_to(chunk_wpos2d, sample_get, &mut chunk);
+        layer::apply_paths_to(chunk_wpos2d, sample_get, &mut chunk, &self.index);
+        layer::apply_caves_to(chunk_wpos2d, sample_get, &mut chunk, &self.index);
 
         // Apply site generation
         sim_chunk.sites.iter().for_each(|site| {
diff --git a/world/src/sim/mod.rs b/world/src/sim/mod.rs
index 584c95dbc0..92a1fe59fe 100644
--- a/world/src/sim/mod.rs
+++ b/world/src/sim/mod.rs
@@ -2,8 +2,8 @@ mod diffusion;
 mod erosion;
 mod location;
 mod map;
-mod way;
 mod util;
+mod way;
 
 // Reexports
 use self::erosion::Compute;
@@ -15,12 +15,12 @@ pub use self::{
     },
     location::Location,
     map::{MapConfig, MapDebug},
-    way::{Way, Path, Cave},
     util::{
         cdf_irwin_hall, downhill, get_oceans, local_cells, map_edge_factor, neighbors,
         uniform_idx_as_vec2, uniform_noise, uphill, vec2_as_uniform_idx, InverseCdf, ScaleBias,
         NEIGHBOR_DELTA,
     },
+    way::{Cave, Path, Way},
 };
 
 use crate::{
@@ -1703,7 +1703,7 @@ impl WorldSim {
     /// Return the distance to the nearest way in blocks, along with the
     /// closest point on the way, the way metadata, and the tangent vector
     /// of that way.
-    pub fn get_nearest_way<M: Clone + Lerp<Output=M>>(
+    pub fn get_nearest_way<M: Clone + Lerp<Output = M>>(
         &self,
         wpos: Vec2<i32>,
         get_way: impl Fn(&SimChunk) -> Option<(Way, M)>,
@@ -1722,7 +1722,8 @@ impl WorldSim {
             .iter()
             .filter_map(|ctrl| {
                 let (way, meta) = get_way(self.get(chunk_pos + *ctrl)?)?;
-                let ctrl_pos = get_chunk_centre(chunk_pos + *ctrl).map(|e| e as f32) + way.offset.map(|e| e as f32);
+                let ctrl_pos = get_chunk_centre(chunk_pos + *ctrl).map(|e| e as f32)
+                    + way.offset.map(|e| e as f32);
 
                 let chunk_connections = way.neighbors.count_ones();
                 if chunk_connections == 0 {
diff --git a/world/src/site/dungeon/mod.rs b/world/src/site/dungeon/mod.rs
index 3e8d7ecc5e..e2decc7fc3 100644
--- a/world/src/site/dungeon/mod.rs
+++ b/world/src/site/dungeon/mod.rs
@@ -467,7 +467,15 @@ impl Floor {
                     if room.boss {
                         let boss_spawn_tile = room.area.center();
                         // Don't spawn the boss in a pillar
-                        let boss_spawn_tile = boss_spawn_tile + if tile_is_pillar { 1 } else { 0 };
+                        let boss_tile_is_pillar = room
+                            .pillars
+                            .map(|pillar_space| {
+                                boss_spawn_tile
+                                    .map(|e| e.rem_euclid(pillar_space) == 0)
+                                    .reduce_and()
+                            })
+                            .unwrap_or(false);
+                        let boss_spawn_tile = boss_spawn_tile + if boss_tile_is_pillar { 1 } else { 0 };
 
                         if tile_pos == boss_spawn_tile && tile_wcenter.xy() == wpos2d {
                             let entity = EntityInfo::at(tile_wcenter.map(|e| e as f32))