Grolantor

He who doesn't Think
The gods and goddesses of the Outer Planes embody all the things of the soul that get invested in emotionally. They are symbols that rise to power through what mortals believe in and care about.

Grolantor is the patron deity of hill giants, and he is not like other gods. One of the third generation sons of Annam the Lord of Giants, he is without a doubt the stupidest god in all the Planes. Some believe he can only be so stupid because he is the god of stupidity, and that his lack of intelligence or wisdom is what makes him so undeniably strong.

After his birth, his father locked him away in Carceri for his evil ways. But once Annam abandoned the Outer Planes and giant kind, Grolantor was free to leave his prison. He then wandered through the Abyss until an army of demons led by a Balor forced him out into the plane of Acheron where he stays because he is simply to powerful to be destroyed.