Cause of danger:
There is a Banai jade vein at the foot of the mountain, and there is a substance that synthesizes "life" in the jade vein, which is mainly manifested in Miruotuo. The Zhangjia Gu Lou is deep in the mountains, within the range covered by jade veins. If someone enters the Zhang family's Gu Lou and fails to go out in time, then the Miro in the jade vein around will surround Gu Lou, and no one can go out again.
Extended data response method:
The Zhang family also has its own methods to deal with Miroto. Milotuo is "afraid" of strong alkali, so Gu Lou has an organ: once there are too many Milotuo around Gu Lou, the Gu Lou organ will start, and a large amount of strong alkali (potassium hydroxide) powder and fog will flood the whole Zhangjia Gu Lou, thus forcing Milotuo to retreat. People in Gu Lou will be atomized into pus by strong alkali.
Zhang Qiling in zhangjia Gu Lou:
Everyone was attacked by strong alkaline gas in Zhangjia Gu Lou. Zhang Qiling saved his life by bloodletting and turtle rest, and was saved by Wu Xie and Wang Pangzi. After bidding farewell to Wu Xie and others, Zhang Qiling entered the Tongmen Gate of Changbai Mountain instead of Wu Xie (according to the agreement, Laojiumen should be on duty by turns, but they violated the agreement). Give the ghost seal to Wu Xie and tell him to come to Changbai Mountain to replace him if he remembers him ten years later.
Baidu Encyclopedia-Zhangjia Gu Lou
Baidu encyclopedia-notes on grave robbery