It is said that more than 4,000 years ago, there was a large river in the north with a depth of thousands of feet and turbulent waves, which was called the fierce water. There is a nine-headed monster in the fierce water, named Jiu Ying, who can spray both water and fire. It breathes fire every ten days, causing the fierce water to boil. Jiuying thinks the water is too hot, so he jumps ashore and eats everyone he sees. The villages living by the river are afraid of it, so they provide tribute to him every time he wants to use it. Therefore, he became the target of Yi's execution.
The Nine Infants are directly produced by heaven and earth. They have no souls and souls, and their bodies are abnormally strong. They are immortal. Each head is a life. There are nine lives. As long as one life is still there, it can be restored by collecting spiritual energy between heaven and earth. Yi knew that it had nine lives. After being shot in the head, not only would it not die, but it would also recover quickly. Therefore, the design was to lead it to Daze Mountain and block it in the mountain, leaving future generations to take care of this place.