Prehistoric: God-Level Sign-In, I Am the Hollow Willow Tree

Traveling through the wilderness, Jiang Chen turned into a hollow willow tree, one of the ten spiritual roots of heaven and earth. It is also bound to a god-level sign-in system. When signing in for the first time, the hollow willow tree is completely integrated, and the soul is transformed into the soul. The second time he signed in, the third time he signed in... As he signed in again and again, Jiang Chen became stronger and stronger. Finally, when he suddenly looked back, Jiang Chen realized that he seemed to be invincible!