Twilight of the Three Kingdoms
Piranoth is the Primordial who came through the divide between the planes during the Argent War, in the process creating his children, the giants. During the Battle of the Wall of Memory, he struck a fierce blow, all but decimating the Dwarves of the White Mountains, the ancestors of Nioi. During the battle he overextended himself, leaving himself weakened. A party of adventurers later closed the rend in space, pulling him back into the Elemental Chaos.
He is currently worshiped by the Cult of the Coming Chaos, who have begun experimenting with their own tears in space-time, in order to bring him back to Dovahnei.