Douluo's Opening Sign and God-Killing Blade

A young man with a "god-level sign-in system" holds a divine sword and is possessed by a dragon soul. His momentum shakes the heaven and earth. He steps into the void with one step. When the divine sword comes out, chaos returns to dust! This sword is called God-Slaying, and it should kill all the gods! This dragon has nine names, and the only one is the god! This person's name is Gu Chen, the Great Demon King of Chaos! [System, invincibility, multiple heroines, passionate]