internal void DestroyEntities(int[] unit_ids)
        {
            Msg_RC_DestroyNpc destroyNpcBuilder = new Msg_RC_DestroyNpc();

            for (int i = 0; i < unit_ids.Length; i++)
            {
                NpcInfo npc = NpcManager.GetNpcInfoByUnitId(unit_ids[i]);
                if (npc != null)
                {
                    destroyNpcBuilder.npc_id = npc.GetId();
                    NotifyAllUser(destroyNpcBuilder);
                    NpcManager.RemoveNpc(npc.GetId());
                }
            }
        }