The Legend of the Tarrasque

Not much is known of the Tarrasque, nor how it was created, tho some have theorised that it was a being made by the pPrimordials before the Cycle, hence why it cannot traditionally die. Known as possibly the most powerful, non-divine being to ever exist, the Tarrasque ravaged much of the world, essentially creating the Deadlands after choosing it as its home. Preying on the yuan-ti of Oshal, destroying anything in its way, eventually the Lesser Gods decided to deal with the Tarrasque and, after permanently scarring the land and banishing the monster to the Underworld, where it now preys on the demons of that realm.