update

scripts/portal/gate.gd

@@ -0,0 +1,34 @@
+extends StaticBody3D
+
+@export var target_scene: String = "res://scenes/dungeon/dungeon.tscn"
+@export var is_exit: bool = false
+
+var active := false
+
+func _ready() -> void:
+  if not is_exit:
+    if GameState.dungeon_cleared:
+      queue_free()
+      return
+    get_tree().create_timer(0.5).timeout.connect(_check_overlapping)
+  else:
+    get_tree().create_timer(1.0).timeout.connect(func() -> void: active = true)
+
+func _check_overlapping() -> void:
+  active = true
+  for body in $GateArea.get_overlapping_bodies():
+    _on_gate_area_body_entered(body)
+
+func _on_gate_area_body_entered(body: Node3D) -> void:
+  if not active:
+    return
+  if body is CharacterBody3D and body.name == "Player":
+    GameState.save_player(body)
+    if is_exit:
+      GameState.returning_from_dungeon = true
+    else:
+      GameState.portal_position = global_position
+    call_deferred("_change_scene")
+
+func _change_scene() -> void:
+  get_tree().change_scene_to_file(target_scene)

scripts/portal/gate.gd.uid

@@ -0,0 +1 @@
+uid://ctci5mc3cd2ck

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":