public override void OnInspectorGUI()
    {
        base.OnInspectorGUI();
        MonsterSpawner spawner = target as MonsterSpawner;

        if (GUILayout.Button("Add Spawn Point"))
        {
            spawner.CreateSpawnPoint();
        }

        if (GUILayout.Button("Force Spawn"))
        {
            spawner.SpawnMonster();
        }
    }