Rovagug, The Rough Beast, The Great Destroyer, Enemy of the Gods, The Unmaker, The Worldbreaker. all titles of Pathfinder's Chaotic Evil deity of wrath, disaster, and destruction.
basically just his front end; he was tricky to say the least.
one of the first beings in this iteration of reality, Rovagug, as the mightiest of qlippoth lords, gnawed his way from the Abyss into the Material Plane after Asmodeus murdered his brother Ihys and devoured the world where it took place.
after destroying countless worlds after, Sarenrae led a collection of gods (many now dead and forgotten) to battle and eventually imprison Rovagug within Golarion's core in a god-made demi-plane known as the Dead Vault.
even while he slumbers and his cage weakens, he has released a dozen of his spawn, including the infamous herald the Tarrasque.
he is not a good boy.