The World Tree/Krazak

Krazak, god of destruction, was created by Gagaur for Althum to serve as his instrument of power. Krazak holds dominion over Acheron, where he creates an unending war, feasting on its bloodshed.

It is said that Krazak also created the Tarrasque and Kraken and released them into the Material Plane, where Althum and Nazuma seek to release them.