Chi Province is the land referred to by the Ancestor of Demons as Yu Province. Ages ago, Chiyou led the Demon race into the Demon Realm, conquered Yu Province, and slew its ruler, the Desire Demon.
Yet the Desire Demon possessed immense cultivation; a wisp of his primordial spirit escaped, taking refuge within a magical treasure to nourish itself. By a twist of fate, it fell into Mo Wushuang’s hands, leading directly to the events that had just unfolded.
"No wonder!" Li Ling realized. "When Mo Wushuang and I crossed the cave and entered the woods, we couldn't control the desires in our hearts. It must have been the desires within Wushuang's body, influenced by that place, radiating invisibly."
Chapter 436