update

scripts/portal/portal.gd

@@ -1,12 +1,23 @@
 extends StaticBody3D
 
+const GATE_SCENE: PackedScene = preload("res://scenes/portal/gate.tscn")
+
 func _ready() -> void:
   add_to_group("portals")
   EventBus.entity_died.connect(_on_entity_died)
 
 func _on_entity_died(entity: Node) -> void:
-  if entity == self:
-    queue_free()
+  if entity != self:
+    return
+  var gate: Node3D = GATE_SCENE.instantiate()
+  gate.global_position = global_position
+  get_parent().add_child(gate)
+  var enemies := get_tree().get_nodes_in_group("enemies")
+  for enemy in enemies:
+    if is_instance_valid(enemy):
+      enemy.queue_free()
+  EventBus.portal_defeated.emit(self)
+  queue_free()
 
 func _on_detection_area_body_entered(body: Node3D) -> void:
   if body is CharacterBody3D and body.name == "Player":