diff --git a/src/main.rs b/src/main.rs
index bb1877b..29cb013 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -11,11 +11,14 @@ mod dbmanager;
 mod jsonmanager;
 mod luamanager;
 
+mod subsystems;
+
 use server::NetworkServer;
 use server::DispatchServer;
 use dbmanager::DatabaseManager;
 use jsonmanager::JsonManager;
 use luamanager::LuaManager;
+use subsystems::EntitySubsystem;
 
 fn main() {
     pretty_env_logger::init();
diff --git a/src/subsystems/entity_subsystem.rs b/src/subsystems/entity_subsystem.rs
new file mode 100644
index 0000000..11723b0
--- /dev/null
+++ b/src/subsystems/entity_subsystem.rs
@@ -0,0 +1,36 @@
+use std::sync::{mpsc, Arc};
+use std::io::Cursor;
+use std::collections::HashMap;
+
+use crate::server::IpcMessage;
+
+use prost::Message;
+
+use packet_processor_macro::*;
+#[macro_use]
+use packet_processor::*;
+use serde::__serialize_unimplemented;
+
+#[packet_processor(
+CombatInvocationsNotify,
+)]
+pub struct EntitySubsystem {
+    packets_to_send_tx: mpsc::Sender<IpcMessage>,
+}
+
+impl EntitySubsystem {
+    pub fn new(packets_to_send_tx: mpsc::Sender<IpcMessage>) -> EntitySubsystem {
+        let mut es = EntitySubsystem {
+            packets_to_send_tx: packets_to_send_tx,
+            packet_callbacks: HashMap::new(),
+        };
+
+        es.register();
+
+        return es;
+    }
+
+    fn process_combat_invocations(&self, user_id: u32, metadata: &proto::PacketHead, notify: &proto::CombatInvocationsNotify) {
+        unimplemented!()
+    }
+}
\ No newline at end of file
diff --git a/src/subsystems/mod.rs b/src/subsystems/mod.rs
new file mode 100644
index 0000000..b3301f2
--- /dev/null
+++ b/src/subsystems/mod.rs
@@ -0,0 +1,3 @@
+mod entity_subsystem;
+
+pub use self::entity_subsystem::EntitySubsystem;
\ No newline at end of file