C259 The Treasure of the Old Demon of Black Mountain？？

In the face of Old Demon Black Mountain, Mo Yi had to understand the situation better. Know yourself and know your enemy, and you will never be defeated.

According to what Mo Yi knew, Old Demon Black Mountain's true form was a black mountain that was formed from cultivation. He had a cultivation base of over a thousand years, and he had a great power in the Yin World