The Rat Messiah by Adam C. Richardson

A cataclysmic event tears the fabric of reality apart. But the world doesn’t end in destruction as all the prophets predicted. Instead, it gets a whole lot stranger.

In this bizarre landscape of mishmash realities, Eddie, Ruby, and a handful of their friends seek to understand what became of the Earth they once knew. They hear rumors of one who will seize the throne of God, a powerful being known as “Usurper”,“Godsbane”, the “Rat Messiah”. He’s reached for ultimate power once before, and if our heroes can’t stop him from trying again, the universe itself will burn.