Fighting with the Immortals with One Sword

The ancient prophecy caused the fall of all the gods. It was a catastrophe in the fairy world. In order to prevent all this, the gods went down to the next world to spread the law and leave a way out for themselves. Immortal? Monster? I don't care about any prophecies, I just want to cultivate immortality honestly. But you say that I am the son of misfortune, the savior of the human world, and the ancestor of all demons...