The last five chapters of the He Sha Book were written in a special ancient script, which few people in the world could recognize. Although Ni Fangxian had been cultivating for many years and came from a side path, he later received a decade of cultivation techniques from Li Jingxu and had been cultivating in seclusion ever since, able to recognize nearly one-third of it.
The Taiyin Hunyuan Ancestor had many Daoist books from the main, side, and evil paths, covering a wide range of topics, and he could recognize most of them.