Onathar, beholder of the deep

They were stories of an entity in the deepest of waters. An ancient entity that once roam in the surface, in a slightly different form. Its power was mighty, Its stare deadly its minions endless and his knoweledge on the world even more vast. A true king of the darkest dungeons Only the bravest adventurers seeked it, for if it deem you interesting it might tell you a truth of the world. But the entity angered the god of the sea and a curse were bestowed on it, mutated it and casted in a prison at the bottom of the sea.