There Is a Magical Weapon Under the Seat, Which Can Kill Immortals and Kill Gods.

Before time travel, I was a security guard and you were delivering food. What should you call me after time travel? The end of cultivating immortals is becoming an immortal, and the end of refining the body is becoming a god. Who are the two people in the protagonist's mind? Fairy? Why do the mythical and vicious beasts kneel down and worship him? Is time travel related to them? Who is "it"? Can we still go back?