Heaven Gang Di Sha Ruyi Book

Zhang Sui got a book. When he opened it, it was three inches long and three inches thick. It was a small booklet with three characters inscribed on it. It was called Ruyi Booklet; The 36 major changes correspond to the number of heavenly gangs, and the 72 minor changes correspond to the number of earth evils. They have the magical effect of shifting the sky and changing battles, and exorcising ghosts and expelling gods.