What is the meaning of the Three Realms Heavenly Book of Immortal Slaying?

The Celestial Slaying Three Realms Heavenly Book was one of the settings in the novel Celestial Slaying. It referred to a secret manual that contained various magical spells and secret techniques that were circulated between the Celestial Slaying World, the Immortal World, and the Demon World. According to the novel, this Heavenly Book could improve the cultivation of cultivators and help them ascend to become immortals or defeat evil forces. In the novel, the protagonist, Xiao Ding, had once obtained this Heavenly Book and relied on its power to realize many dreams.