C509 Fighting Against Chu Mu(13)

It was because Chu Mu didn't know about the existence of the Heaven Devouring Art, and he didn't know that the Heaven Devouring Art didn't consume any spiritual energy at all!

As long as Xia Xingchen had the Spirit Stone and the rich spiritual energy of heaven and earth around him, Xia Xingchen would be able to use the innate power endlessly, and he would be able to maintain his peak condition