Tiangong Lock

It is not an ordinary lock, but an ultimate means to seal "taboos" created by a very clever wizard in ancient times (a master who combined Mozi's mechanism skills and Zou Yan's yin-yang and five-element theories). These taboos may be some kind of terrible force, a tampered historical truth, or even a sleeping monster. The so-called "Tiangong lock" does not have to be in the shape of a lock. It can be a set of chimes (melody lock), a garden (layout lock), a set of recipes (five-flavor lock), or even a book made of human skin (numerology lock). He could be what the book says...