diff --git a/boss/fsm.cpp b/boss/fsm.cpp
new file mode 100644
index 0000000..d318c45
--- /dev/null
+++ b/boss/fsm.cpp
@@ -0,0 +1,11 @@
+#include "boss/fsm.hpp"
+
+namespace boss {
+  FSM::FSM() {
+  }
+
+  void event(Event ev, std::any data={}) {
+    (void)ev;
+    (void)data;
+  }
+}
diff --git a/boss/fsm.hpp b/boss/fsm.hpp
new file mode 100644
index 0000000..b04d4af
--- /dev/null
+++ b/boss/fsm.hpp
@@ -0,0 +1,21 @@
+#pragma once
+
+#include "simplefsm.hpp"
+#include <any>
+
+namespace boss {
+  enum class State {
+    START=0,
+    END=1
+  };
+
+  enum class Event {
+    NOP
+  };
+
+  class FSM : public DeadSimpleFSM<State, Event> {
+    FSM();
+
+    void event(Event ev, std::any data={});
+  };
+}
diff --git a/meson.build b/meson.build
index 0def83f..26c21c1 100644
--- a/meson.build
+++ b/meson.build
@@ -86,6 +86,7 @@ sources = [
   'autowalker.cpp',
   'backend.cpp',
   'battle.cpp',
+  'boss/fsm.cpp',
   'boss/system.cpp',
   'boss/ui.cpp',
   'combat.cpp',