The Godswar Chronicles
Rovagug the Destroyer
Imprisoned since the dawn of time, Rovagug seeks only to destroy creation and the gods.
In a time so long ago that none remember it, Rovagug sought to destroy the world. In a rare showing of solidarity, all the gods stood together to defeat him. Unable, or perhaps unwilling, to destroy him, the gods opened a hole in the world, and sealed the beast away.
It was an imperfect captivity and 4388 years later, by mortal account, The Councillor opened a hole within the prison and allowed the destroyer to touch the world once again.