diff --git a/common/src/rtsim.rs b/common/src/rtsim.rs
index 6bfe625fea..80b541c1c7 100644
--- a/common/src/rtsim.rs
+++ b/common/src/rtsim.rs
@@ -11,6 +11,8 @@ use crate::comp::dialogue::MoodState;
 
 slotmap::new_key_type! { pub struct NpcId; }
 
+slotmap::new_key_type! { pub struct SiteId; }
+
 #[derive(Copy, Clone, Debug)]
 pub struct RtSimEntity(pub NpcId);
 
diff --git a/rtsim/src/data/mod.rs b/rtsim/src/data/mod.rs
index c68797db4f..e1a7d66adb 100644
--- a/rtsim/src/data/mod.rs
+++ b/rtsim/src/data/mod.rs
@@ -1,8 +1,10 @@
 pub mod npc;
+pub mod site;
 pub mod nature;
 
 pub use self::{
     npc::{Npc, NpcId, Npcs},
+    site::{Site, SiteId, Sites},
     nature::Nature,
 };
 
@@ -25,6 +27,7 @@ pub enum Actor {
 pub struct Data {
     pub nature: Nature,
     pub npcs: Npcs,
+    pub sites: Sites,
 }
 
 pub type ReadError = rmp_serde::decode::Error;
@@ -40,13 +43,6 @@ impl Data {
     }
 }
 
-// fn rugged_ser_enum_map<K: EnumArray<V> + Serialize, V: PartialEq + Default + Serialize, S: ser::Serializer>(map: &EnumMap<K, V>, mut ser: S) -> Result<S::Ok, S::Error> {
-//     ser.collect_map(map
-//         .iter()
-//         .filter(|(k, v)| v != &&V::default())
-//         .map(|(k, v)| (k, v)))
-// }
-
 fn rugged_ser_enum_map<
     K: EnumArray<V> + Serialize,
     V: From<i16> + PartialEq + Serialize,
diff --git a/rtsim/src/data/npc.rs b/rtsim/src/data/npc.rs
index 6f2f0d6151..c01b3b0081 100644
--- a/rtsim/src/data/npc.rs
+++ b/rtsim/src/data/npc.rs
@@ -3,21 +3,47 @@ use serde::{Serialize, Deserialize};
 use slotmap::HopSlotMap;
 use vek::*;
 use std::ops::{Deref, DerefMut};
-use common::uid::Uid;
-
+use common::{
+    uid::Uid,
+    store::Id,
+    rtsim::SiteId,
+};
 pub use common::rtsim::NpcId;
 
 #[derive(Clone, Serialize, Deserialize)]
 pub struct Npc {
-    pub wpos: Vec3<f32>,
+    // Persisted state
+
+    /// Represents the location of the NPC.
+    pub loc: NpcLoc,
+
+    // Unpersisted state
+
+    /// The position of the NPC in the world. Note that this is derived from [`Npc::loc`] and cannot be updated manually
+    #[serde(skip_serializing, skip_deserializing)]
+    wpos: Vec3<f32>,
+    /// Whether the NPC is in simulated or loaded mode (when rtsim is run on the server, loaded corresponds to being
+    /// within a loaded chunk). When in loaded mode, the interactions of the NPC should not be simulated but should
+    /// instead be derived from the game.
     #[serde(skip_serializing, skip_deserializing)]
     pub mode: NpcMode,
 }
 
 impl Npc {
-    pub fn at(wpos: Vec3<f32>) -> Self {
-        Self { wpos, mode: NpcMode::Simulated }
+    pub fn new(loc: NpcLoc) -> Self {
+        Self {
+            loc,
+            wpos: Vec3::zero(),
+            mode: NpcMode::Simulated,
+        }
     }
+
+    pub fn wpos(&self) -> Vec3<f32> { self.wpos }
+
+    /// You almost certainly *DO NOT* want to use this method.
+    ///
+    /// Update the NPC's wpos as a result of routine NPC simulation derived from its location.
+    pub(crate) fn tick_wpos(&mut self, wpos: Vec3<f32>) { self.wpos = wpos; }
 }
 
 #[derive(Copy, Clone, Default)]
@@ -29,13 +55,24 @@ pub enum NpcMode {
     Loaded,
 }
 
+#[derive(Clone, Serialize, Deserialize)]
+pub enum NpcLoc {
+    Wild { wpos: Vec3<f32> },
+    Site { site: SiteId, wpos: Vec3<f32> },
+    Travelling {
+        a: SiteId,
+        b: SiteId,
+        frac: f32,
+    },
+}
+
 #[derive(Clone, Serialize, Deserialize)]
 pub struct Npcs {
     pub npcs: HopSlotMap<NpcId, Npc>,
 }
 
 impl Npcs {
-    pub fn spawn(&mut self, npc: Npc) -> NpcId {
+    pub fn create(&mut self, npc: Npc) -> NpcId {
         self.npcs.insert(npc)
     }
 }
diff --git a/rtsim/src/data/site.rs b/rtsim/src/data/site.rs
new file mode 100644
index 0000000000..6e34be73d0
--- /dev/null
+++ b/rtsim/src/data/site.rs
@@ -0,0 +1,47 @@
+use hashbrown::HashMap;
+use serde::{Serialize, Deserialize};
+use slotmap::HopSlotMap;
+use vek::*;
+use std::ops::{Deref, DerefMut};
+use common::{
+    uid::Uid,
+    store::Id,
+};
+pub use common::rtsim::SiteId;
+use world::site::Site as WorldSite;
+
+#[derive(Clone, Serialize, Deserialize)]
+pub struct Site {
+    pub wpos: Vec2<i32>,
+
+    /// The site generated during initial worldgen that this site corresponds to.
+    ///
+    /// Eventually, rtsim should replace initial worldgen's site system and this will not be necessary.
+    ///
+    /// When setting up rtsim state, we try to 'link' these two definitions of a site: but if initial worldgen has
+    /// changed, this might not be possible. We try to delete sites that no longer exist during setup, but this is an
+    /// inherent fallible process. If linking fails, we try to delete the site in rtsim2 in order to avoid an
+    /// 'orphaned' site. (TODO: create new sites for new initial worldgen sites that come into being too).
+    #[serde(skip_serializing, skip_deserializing)]
+    pub world_site: Option<Id<WorldSite>>,
+}
+
+#[derive(Clone, Serialize, Deserialize)]
+pub struct Sites {
+    pub sites: HopSlotMap<SiteId, Site>,
+}
+
+impl Sites {
+    pub fn create(&mut self, site: Site) -> SiteId {
+        self.sites.insert(site)
+    }
+}
+
+impl Deref for Sites {
+    type Target = HopSlotMap<SiteId, Site>;
+    fn deref(&self) -> &Self::Target { &self.sites }
+}
+
+impl DerefMut for Sites {
+    fn deref_mut(&mut self) -> &mut Self::Target { &mut self.sites }
+}
diff --git a/rtsim/src/event.rs b/rtsim/src/event.rs
index deb35cc68c..298cebf8c8 100644
--- a/rtsim/src/event.rs
+++ b/rtsim/src/event.rs
@@ -1,8 +1,21 @@
 use common::resources::Time;
+use world::{World, IndexRef};
+use super::{Rule, RtState};
 
 pub trait Event: Clone + 'static {}
 
+pub struct EventCtx<'a, R: Rule, E: Event> {
+    pub state: &'a RtState,
+    pub rule: &'a mut R,
+    pub event: &'a E,
+    pub world: &'a World,
+    pub index: IndexRef<'a>,
+}
+
+#[derive(Clone)]
+pub struct OnSetup;
+impl Event for OnSetup {}
+
 #[derive(Clone)]
 pub struct OnTick { pub dt: f32 }
-
 impl Event for OnTick {}
diff --git a/rtsim/src/gen/mod.rs b/rtsim/src/gen/mod.rs
index fb2d3829a8..4e0877c240 100644
--- a/rtsim/src/gen/mod.rs
+++ b/rtsim/src/gen/mod.rs
@@ -1,6 +1,14 @@
-use crate::data::{Npcs, Npc, Data, Nature};
+pub mod site;
+
+use crate::data::{
+    npc::{Npcs, Npc, NpcLoc},
+    site::{Sites, Site},
+    Data,
+    Nature,
+};
 use hashbrown::HashMap;
 use rand::prelude::*;
+use tracing::info;
 use world::{
     site::SiteKind,
     IndexRef,
@@ -8,7 +16,7 @@ use world::{
 };
 
 impl Data {
-    pub fn generate(index: IndexRef, world: &World) -> Self {
+    pub fn generate(world: &World, index: IndexRef) -> Self {
         let mut seed = [0; 32];
         seed.iter_mut().zip(&mut index.seed.to_le_bytes()).for_each(|(dst, src)| *dst = *src);
         let mut rng = SmallRng::from_seed(seed);
@@ -16,25 +24,25 @@ impl Data {
         let mut this = Self {
             nature: Nature::generate(world),
             npcs: Npcs { npcs: Default::default() },
+            sites: Sites { sites: Default::default() },
         };
 
-        for (site_id, site) in world
-            .civs()
+        // Register sites with rtsim
+        for (world_site_id, _) in index
             .sites
             .iter()
-            .filter_map(|(site_id, site)| site.site_tmp.map(|id| (site_id, &index.sites[id])))
         {
-            match &site.kind {
-                SiteKind::Refactor(site2) => {
-                    let wpos = site.get_origin()
-                        .map(|e| e as f32 + 0.5)
-                        .with_z(world.sim().get_alt_approx(site.get_origin()).unwrap_or(0.0));
-                    // TODO: Better API
-                    this.npcs.spawn(Npc::at(wpos));
-                    println!("Spawned rtsim NPC at {:?}", wpos);
-                }
-                _ => {},
-            }
+            let site = Site::generate(world_site_id, world, index);
+            this.sites.create(site);
+        }
+        info!("Registering {} rtsim sites from world sites.", this.sites.len());
+
+        // Spawn some test entities at the sites
+        for (site_id, site) in this.sites.iter() {
+            let wpos = site.wpos.map(|e| e as f32)
+                .with_z(world.sim().get_alt_approx(site.wpos).unwrap_or(0.0));
+            this.npcs.create(Npc::new(NpcLoc::Site { site: site_id, wpos }));
+            println!("Spawned rtsim NPC at {:?}", wpos);
         }
 
         this
diff --git a/rtsim/src/gen/site.rs b/rtsim/src/gen/site.rs
new file mode 100644
index 0000000000..75a0876611
--- /dev/null
+++ b/rtsim/src/gen/site.rs
@@ -0,0 +1,25 @@
+use crate::data::Site;
+use common::store::Id;
+use world::{
+    site::Site as WorldSite,
+    World,
+    IndexRef,
+};
+
+impl Site {
+    pub fn generate(world_site: Id<WorldSite>, world: &World, index: IndexRef) -> Self {
+        // match &world_site.kind {
+        //     SiteKind::Refactor(site2) => {
+        //         let site = Site::generate(world_site_id, world, index);
+        //         println!("Registering rtsim site at {:?}...", site.wpos);
+        //         this.sites.create(site);
+        //     }
+        //     _ => {},
+        // }
+
+        Self {
+            wpos: index.sites.get(world_site).get_origin(),
+            world_site: Some(world_site),
+        }
+    }
+}
diff --git a/rtsim/src/lib.rs b/rtsim/src/lib.rs
index 1397d99dd8..84de682836 100644
--- a/rtsim/src/lib.rs
+++ b/rtsim/src/lib.rs
@@ -7,9 +7,10 @@ pub mod rule;
 
 pub use self::{
     data::Data,
-    event::{Event, OnTick},
+    event::{Event, EventCtx, OnTick},
     rule::{Rule, RuleError},
 };
+use world::{World, IndexRef};
 use anymap2::SendSyncAnyMap;
 use tracing::{info, error};
 use atomic_refcell::AtomicRefCell;
@@ -25,7 +26,7 @@ pub struct RtState {
 }
 
 type RuleState<R> = AtomicRefCell<R>;
-type EventHandlersOf<E> = Vec<Box<dyn Fn(&RtState, E) + Send + Sync + 'static>>;
+type EventHandlersOf<E> = Vec<Box<dyn Fn(&RtState, &World, IndexRef, &E) + Send + Sync + 'static>>;
 
 impl RtState {
     pub fn new(data: Data) -> Self {
@@ -48,7 +49,8 @@ impl RtState {
 
     fn start_default_rules(&mut self) {
         info!("Starting default rtsim rules...");
-        self.start_rule::<rule::example::RuleState>();
+        self.start_rule::<rule::simulate_npcs::SimulateNpcs>();
+        self.start_rule::<rule::setup::Setup>();
     }
 
     pub fn start_rule<R: Rule>(&mut self) {
@@ -66,13 +68,19 @@ impl RtState {
             .borrow_mut()
     }
 
-    pub fn bind<R: Rule, E: Event>(&mut self, mut f: impl FnMut(&mut R, &RtState, E) + Send + Sync + 'static) {
+    pub fn bind<R: Rule, E: Event>(&mut self, mut f: impl FnMut(EventCtx<R, E>) + Send + Sync + 'static) {
         let f = AtomicRefCell::new(f);
         self.event_handlers
             .entry::<EventHandlersOf<E>>()
             .or_default()
-            .push(Box::new(move |rtstate, event| {
-                (f.borrow_mut())(&mut rtstate.rule_mut(), rtstate, event)
+            .push(Box::new(move |state, world, index, event| {
+                (f.borrow_mut())(EventCtx {
+                    state,
+                    rule: &mut state.rule_mut(),
+                    event,
+                    world,
+                    index,
+                })
             }));
     }
 
@@ -93,15 +101,15 @@ impl RtState {
             .borrow_mut()
     }
 
-    pub fn emit<E: Event>(&mut self, e: E) {
+    pub fn emit<E: Event>(&mut self, e: E, world: &World, index: IndexRef) {
         self.event_handlers
             .get::<EventHandlersOf<E>>()
             .map(|handlers| handlers
                 .iter()
-                .for_each(|f| f(self, e.clone())));
+                .for_each(|f| f(self, world, index, &e)));
     }
 
-    pub fn tick(&mut self, dt: f32) {
-        self.emit(OnTick { dt });
+    pub fn tick(&mut self, world: &World, index: IndexRef, dt: f32) {
+        self.emit(OnTick { dt }, world, index);
     }
 }
diff --git a/rtsim/src/rule.rs b/rtsim/src/rule.rs
index 6f6b701740..0547d4d277 100644
--- a/rtsim/src/rule.rs
+++ b/rtsim/src/rule.rs
@@ -1,4 +1,5 @@
-pub mod example;
+pub mod setup;
+pub mod simulate_npcs;
 
 use std::fmt;
 use super::RtState;
diff --git a/rtsim/src/rule/example.rs b/rtsim/src/rule/example.rs
deleted file mode 100644
index d4cda69920..0000000000
--- a/rtsim/src/rule/example.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-use tracing::info;
-use crate::{
-    event::OnTick,
-    RtState, Rule, RuleError,
-};
-
-pub struct RuleState;
-
-impl Rule for RuleState {
-    fn start(rtstate: &mut RtState) -> Result<Self, RuleError> {
-        info!("Hello from example rule!");
-
-        rtstate.bind::<Self, OnTick>(|this, rtstate, event| {
-            // println!("Tick!");
-        });
-
-        Ok(Self)
-    }
-}
diff --git a/rtsim/src/rule/setup.rs b/rtsim/src/rule/setup.rs
new file mode 100644
index 0000000000..5bdb00a373
--- /dev/null
+++ b/rtsim/src/rule/setup.rs
@@ -0,0 +1,48 @@
+use tracing::warn;
+use crate::{
+    data::Site,
+    event::OnSetup,
+    RtState, Rule, RuleError,
+};
+
+/// This rule runs at rtsim startup and broadly acts to perform some primitive migration/sanitisation in order to
+/// ensure that the state of rtsim is mostly sensible.
+pub struct Setup;
+
+impl Rule for Setup {
+    fn start(rtstate: &mut RtState) -> Result<Self, RuleError> {
+        rtstate.bind::<Self, OnSetup>(|ctx| {
+            // Delete rtsim sites that don't correspond to a world site
+            ctx.state.data_mut().sites.retain(|site_id, site| {
+                if let Some((world_site_id, _)) = ctx.index.sites
+                    .iter()
+                    .find(|(_, world_site)| world_site.get_origin() == site.wpos)
+                {
+                    site.world_site = Some(world_site_id);
+                    true
+                } else {
+                    warn!("{:?} is no longer valid because the site it was derived from no longer exists. It will now be deleted.", site_id);
+                    false
+                }
+            });
+
+            // Generate rtsim sites for world sites that don't have a corresponding rtsim site yet
+            for (world_site_id, _) in ctx.index.sites.iter() {
+                if !ctx.state.data().sites
+                    .values()
+                    .any(|site| site.world_site.expect("Rtsim site not assigned to world site") == world_site_id)
+                {
+                    warn!("{:?} is new and does not have a corresponding rtsim site. One will now be generated afresh.", world_site_id);
+                    ctx.state
+                        .data_mut()
+                        .sites
+                        .create(Site::generate(world_site_id, ctx.world, ctx.index));
+                }
+            }
+
+            // TODO: Reassign sites for NPCs if they don't have one
+        });
+
+        Ok(Self)
+    }
+}
diff --git a/rtsim/src/rule/simulate_npcs.rs b/rtsim/src/rule/simulate_npcs.rs
new file mode 100644
index 0000000000..dae9ed6502
--- /dev/null
+++ b/rtsim/src/rule/simulate_npcs.rs
@@ -0,0 +1,25 @@
+use tracing::info;
+use crate::{
+    data::npc::NpcLoc,
+    event::OnTick,
+    RtState, Rule, RuleError,
+};
+
+pub struct SimulateNpcs;
+
+impl Rule for SimulateNpcs {
+    fn start(rtstate: &mut RtState) -> Result<Self, RuleError> {
+
+        rtstate.bind::<Self, OnTick>(|ctx| {
+            for (_, npc) in ctx.state.data_mut().npcs.iter_mut() {
+                npc.tick_wpos(match npc.loc {
+                    NpcLoc::Wild { wpos } => wpos,
+                    NpcLoc::Site { site, wpos } => wpos,
+                    NpcLoc::Travelling { a, b, frac } => todo!(),
+                });
+            }
+        });
+
+        Ok(Self)
+    }
+}
diff --git a/server/src/events/entity_manipulation.rs b/server/src/events/entity_manipulation.rs
index 8046e23e9b..3307d80ed8 100644
--- a/server/src/events/entity_manipulation.rs
+++ b/server/src/events/entity_manipulation.rs
@@ -9,6 +9,7 @@ use crate::{
     },
     // rtsim::RtSim,
     sys::terrain::SAFE_ZONE_RADIUS,
+    rtsim2,
     Server, SpawnPoint, StateExt,
 };
 use authc::Uuid;
@@ -26,7 +27,7 @@ use common::{
     event::{EventBus, ServerEvent},
     outcome::{HealthChangeInfo, Outcome},
     resources::{Secs, Time},
-    // rtsim::RtSimEntity,
+    rtsim::RtSimEntity,
     states::utils::{AbilityInfo, StageSection},
     terrain::{Block, BlockKind, TerrainGrid},
     uid::{Uid, UidAllocator},
@@ -519,7 +520,6 @@ pub fn handle_destroy(server: &mut Server, entity: EcsEntity, last_change: Healt
     }
 
     if should_delete {
-        /*
         if let Some(rtsim_entity) = state
             .ecs()
             .read_storage::<RtSimEntity>()
@@ -528,10 +528,9 @@ pub fn handle_destroy(server: &mut Server, entity: EcsEntity, last_change: Healt
         {
             state
                 .ecs()
-                .write_resource::<RtSim>()
-                .destroy_entity(rtsim_entity.0);
+                .write_resource::<rtsim2::RtSim>()
+                .hook_rtsim_entity_delete(rtsim_entity);
         }
-        */
 
         if let Err(e) = state.delete_entity_recorded(entity) {
             error!(?e, ?entity, "Failed to delete destroyed entity");
diff --git a/server/src/lib.rs b/server/src/lib.rs
index de19d3a7c7..e7baa3c55e 100644
--- a/server/src/lib.rs
+++ b/server/src/lib.rs
@@ -707,7 +707,13 @@ impl Server {
         fn on_block_update(ecs: &specs::World, wpos: Vec3<i32>, old_block: Block, new_block: Block) {
             // When a resource block updates, inform rtsim
             if old_block.get_rtsim_resource().is_some() || new_block.get_rtsim_resource().is_some() {
-                ecs.write_resource::<rtsim2::RtSim>().hook_block_update(wpos, old_block, new_block);
+                ecs.write_resource::<rtsim2::RtSim>().hook_block_update(
+                    &ecs.read_resource::<Arc<world::World>>(),
+                    ecs.read_resource::<Arc<world::IndexOwned>>().as_index_ref(),
+                    wpos,
+                    old_block,
+                    new_block,
+                );
             }
         }
 
diff --git a/server/src/rtsim2/mod.rs b/server/src/rtsim2/mod.rs
index fa73f1fe0c..a0f6cf6d33 100644
--- a/server/src/rtsim2/mod.rs
+++ b/server/src/rtsim2/mod.rs
@@ -17,6 +17,7 @@ use rtsim2::{
         ReadError,
     },
     rule::Rule,
+    event::OnSetup,
     RtState,
 };
 use specs::{DispatcherBuilder, WorldExt};
@@ -80,7 +81,7 @@ impl RtSim {
                 warn!("'RTSIM_NOLOAD' is set, skipping loading of rtsim state (old state will be overwritten).");
             }
 
-            let data = Data::generate(index, &world);
+            let data = Data::generate(&world, index);
             info!("Rtsim data generated.");
             data
         };
@@ -94,6 +95,8 @@ impl RtSim {
 
         rule::start_rules(&mut this.state);
 
+        this.state.emit(OnSetup, world, index);
+
         Ok(this)
     }
 
@@ -120,8 +123,8 @@ impl RtSim {
         }
     }
 
-    pub fn hook_block_update(&mut self, wpos: Vec3<i32>, old: Block, new: Block) {
-        self.state.emit(event::OnBlockChange { wpos, old, new });
+    pub fn hook_block_update(&mut self, world: &World, index: IndexRef, wpos: Vec3<i32>, old: Block, new: Block) {
+        self.state.emit(event::OnBlockChange { wpos, old, new }, world, index);
     }
 
     pub fn hook_rtsim_entity_unload(&mut self, entity: RtSimEntity) {
@@ -130,6 +133,11 @@ impl RtSim {
         }
     }
 
+    pub fn hook_rtsim_entity_delete(&mut self, entity: RtSimEntity) {
+        // TODO: Emit event on deletion to catch death?
+        self.state.data_mut().npcs.remove(entity.0);
+    }
+
     pub fn save(&mut self, slowjob_pool: &SlowJobPool) {
         info!("Saving rtsim data...");
         let file_path = self.file_path.clone();
diff --git a/server/src/rtsim2/rule.rs b/server/src/rtsim2/rule.rs
index 41dd191507..2f349b5368 100644
--- a/server/src/rtsim2/rule.rs
+++ b/server/src/rtsim2/rule.rs
@@ -5,5 +5,5 @@ use rtsim2::RtState;
 
 pub fn start_rules(rtstate: &mut RtState) {
     info!("Starting server rtsim rules...");
-    rtstate.start_rule::<deplete_resources::State>();
+    rtstate.start_rule::<deplete_resources::DepleteResources>();
 }
diff --git a/server/src/rtsim2/rule/deplete_resources.rs b/server/src/rtsim2/rule/deplete_resources.rs
index fe13a2d190..1041576977 100644
--- a/server/src/rtsim2/rule/deplete_resources.rs
+++ b/server/src/rtsim2/rule/deplete_resources.rs
@@ -9,20 +9,20 @@ use common::{
     vol::RectRasterableVol,
 };
 
-pub struct State;
+pub struct DepleteResources;
 
-impl Rule for State {
+impl Rule for DepleteResources {
     fn start(rtstate: &mut RtState) -> Result<Self, RuleError> {
         info!("Hello from the resource depletion rule!");
 
-        rtstate.bind::<Self, OnBlockChange>(|this, rtstate, event| {
-            let key = event.wpos
+        rtstate.bind::<Self, OnBlockChange>(|ctx| {
+            let key = ctx.event.wpos
                 .xy()
                 .map2(TerrainChunk::RECT_SIZE, |e, sz| e.div_euclid(sz as i32));
-            if let Some(Some(chunk_state)) = rtstate.resource_mut::<ChunkStates>().0.get(key) {
-                let mut chunk_res = rtstate.data().nature.get_chunk_resources(key);
+            if let Some(Some(chunk_state)) = ctx.state.resource_mut::<ChunkStates>().0.get(key) {
+                let mut chunk_res = ctx.state.data().nature.get_chunk_resources(key);
                 // Remove resources
-                if let Some(res) = event.old.get_rtsim_resource() {
+                if let Some(res) = ctx.event.old.get_rtsim_resource() {
                     if chunk_state.max_res[res] > 0 {
                         chunk_res[res] = (chunk_res[res] * chunk_state.max_res[res] as f32 - 1.0)
                             .round()
@@ -30,7 +30,7 @@ impl Rule for State {
                     }
                 }
                 // Add resources
-                if let Some(res) = event.new.get_rtsim_resource() {
+                if let Some(res) = ctx.event.new.get_rtsim_resource() {
                     if chunk_state.max_res[res] > 0 {
                         chunk_res[res] = (chunk_res[res] * chunk_state.max_res[res] as f32 + 1.0)
                             .round()
@@ -38,7 +38,7 @@ impl Rule for State {
                     }
                 }
                 println!("Chunk resources = {:?}", chunk_res);
-                rtstate.data_mut().nature.set_chunk_resources(key, chunk_res);
+                ctx.state.data_mut().nature.set_chunk_resources(key, chunk_res);
             }
         });
 
diff --git a/server/src/rtsim2/tick.rs b/server/src/rtsim2/tick.rs
index 1f1fdc0d3d..bcd577594b 100644
--- a/server/src/rtsim2/tick.rs
+++ b/server/src/rtsim2/tick.rs
@@ -39,7 +39,7 @@ impl<'a> System<'a> for Sys {
         let mut emitter = server_event_bus.emitter();
         let rtsim = &mut *rtsim;
 
-        rtsim.state.tick(dt.0);
+        rtsim.state.tick(&world, index.as_index_ref(), dt.0);
 
         if rtsim.last_saved.map_or(true, |ls| ls.elapsed() > Duration::from_secs(60)) {
             rtsim.save(&slow_jobs);
@@ -47,7 +47,7 @@ impl<'a> System<'a> for Sys {
 
         let chunk_states = rtsim.state.resource::<ChunkStates>();
         for (npc_id, npc) in rtsim.state.data_mut().npcs.iter_mut() {
-            let chunk = npc.wpos
+            let chunk = npc.wpos()
                 .xy()
                 .map2(TerrainChunk::RECT_SIZE, |e, sz| (e as i32).div_euclid(sz as i32));
 
@@ -55,11 +55,9 @@ impl<'a> System<'a> for Sys {
             if matches!(npc.mode, NpcMode::Simulated) && chunk_states.0.get(chunk).map_or(false, |c| c.is_some()) {
                 npc.mode = NpcMode::Loaded;
 
-                println!("Loading in rtsim NPC at {:?}", npc.wpos);
-
                 let body = comp::Body::Object(comp::object::Body::Scarecrow);
                 emitter.emit(ServerEvent::CreateNpc {
-                    pos: comp::Pos(npc.wpos),
+                    pos: comp::Pos(npc.wpos()),
                     stats: comp::Stats::new("Rtsim NPC".to_string()),
                     skill_set: comp::SkillSet::default(),
                     health: None,
diff --git a/voxygen/src/scene/debug.rs b/voxygen/src/scene/debug.rs
index b0fb2959f7..3ab11ba0d5 100644
--- a/voxygen/src/scene/debug.rs
+++ b/voxygen/src/scene/debug.rs
@@ -7,7 +7,7 @@ use hashbrown::{HashMap, HashSet};
 use tracing::warn;
 use vek::*;
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq)]
 pub enum DebugShape {
     Line([Vec3<f32>; 2]),
     Cylinder {
@@ -261,7 +261,8 @@ pub struct DebugShapeId(pub u64);
 
 pub struct Debug {
     next_shape_id: DebugShapeId,
-    pending_shapes: HashMap<DebugShapeId, DebugShape>,
+    shapes: HashMap<DebugShapeId, DebugShape>,
+    pending: HashSet<DebugShapeId>,
     pending_locals: HashMap<DebugShapeId, ([f32; 4], [f32; 4], [f32; 4])>,
     pending_deletes: HashSet<DebugShapeId>,
     models: HashMap<DebugShapeId, (Model<DebugVertex>, Bound<Consts<DebugLocals>>)>,
@@ -272,7 +273,8 @@ impl Debug {
     pub fn new() -> Debug {
         Debug {
             next_shape_id: DebugShapeId(0),
-            pending_shapes: HashMap::new(),
+            shapes: HashMap::new(),
+            pending: HashSet::new(),
             pending_locals: HashMap::new(),
             pending_deletes: HashSet::new(),
             models: HashMap::new(),
@@ -286,10 +288,15 @@ impl Debug {
         if matches!(shape, DebugShape::TrainTrack { .. }) {
             self.casts_shadow.insert(id);
         }
-        self.pending_shapes.insert(id, shape);
+        self.shapes.insert(id, shape);
+        self.pending.insert(id);
         id
     }
 
+    pub fn get_shape(&self, id: DebugShapeId) -> Option<&DebugShape> {
+        self.shapes.get(&id)
+    }
+
     pub fn set_context(&mut self, id: DebugShapeId, pos: [f32; 4], color: [f32; 4], ori: [f32; 4]) {
         self.pending_locals.insert(id, (pos, color, ori));
     }
@@ -297,19 +304,21 @@ impl Debug {
     pub fn remove_shape(&mut self, id: DebugShapeId) { self.pending_deletes.insert(id); }
 
     pub fn maintain(&mut self, renderer: &mut Renderer) {
-        for (id, shape) in self.pending_shapes.drain() {
-            if let Some(model) = renderer.create_model(&shape.mesh()) {
-                let locals = renderer.create_debug_bound_locals(&[DebugLocals {
-                    pos: [0.0; 4],
-                    color: [1.0, 0.0, 0.0, 1.0],
-                    ori: [0.0, 0.0, 0.0, 1.0],
-                }]);
-                self.models.insert(id, (model, locals));
-            } else {
-                warn!(
-                    "Failed to create model for debug shape {:?}: {:?}",
-                    id, shape
-                );
+        for id in self.pending.drain() {
+            if let Some(shape) = self.shapes.get(&id) {
+                if let Some(model) = renderer.create_model(&shape.mesh()) {
+                    let locals = renderer.create_debug_bound_locals(&[DebugLocals {
+                        pos: [0.0; 4],
+                        color: [1.0, 0.0, 0.0, 1.0],
+                        ori: [0.0, 0.0, 0.0, 1.0],
+                    }]);
+                    self.models.insert(id, (model, locals));
+                } else {
+                    warn!(
+                        "Failed to create model for debug shape {:?}: {:?}",
+                        id, shape
+                    );
+                }
             }
         }
         for (id, (pos, color, ori)) in self.pending_locals.drain() {
@@ -330,6 +339,7 @@ impl Debug {
         }
         for id in self.pending_deletes.drain() {
             self.models.remove(&id);
+            self.shapes.remove(&id);
         }
     }
 
diff --git a/voxygen/src/scene/mod.rs b/voxygen/src/scene/mod.rs
index ab7cf11a62..08cccdf9bb 100644
--- a/voxygen/src/scene/mod.rs
+++ b/voxygen/src/scene/mod.rs
@@ -1465,17 +1465,28 @@ impl Scene {
                         z_min,
                         z_max,
                     } => {
+                        let scale = scale.map_or(1.0, |s| s.0);
                         current_entities.insert(entity);
-                        let s = scale.map_or(1.0, |sc| sc.0);
+
+                        let shape = DebugShape::CapsulePrism {
+                            p0: *p0 * scale,
+                            p1: *p1 * scale,
+                            radius: *radius * scale,
+                            height: (*z_max - *z_min) * scale,
+                        };
+
+                        // If this shape no longer matches, remove the old one
+                        if let Some(shape_id) = hitboxes.get(&entity) {
+                            if self.debug.get_shape(*shape_id).map_or(false, |s| s != &shape) {
+                                self.debug.remove_shape(*shape_id);
+                                hitboxes.remove(&entity);
+                            }
+                        }
+
                         let shape_id = hitboxes.entry(entity).or_insert_with(|| {
-                            self.debug.add_shape(DebugShape::CapsulePrism {
-                                p0: *p0 * s,
-                                p1: *p1 * s,
-                                radius: *radius * s,
-                                height: (*z_max - *z_min) * s,
-                            })
+                            self.debug.add_shape(shape)
                         });
-                        let hb_pos = [pos.0.x, pos.0.y, pos.0.z + *z_min, 0.0];
+                        let hb_pos = [pos.0.x, pos.0.y, pos.0.z + *z_min * scale, 0.0];
                         let color = if group == Some(&comp::group::ENEMY) {
                             [1.0, 0.0, 0.0, 0.5]
                         } else if group == Some(&comp::group::NPC) {
diff --git a/world/src/civ/mod.rs b/world/src/civ/mod.rs
index 3f7d6e7ea7..6aaef9b714 100644
--- a/world/src/civ/mod.rs
+++ b/world/src/civ/mod.rs
@@ -1430,6 +1430,7 @@ fn find_site_loc(
             });
         }
     }
+
     debug!("Failed to place site {:?}.", site_kind);
     None
 }