Little is known of these ancient and terrible creatures of the Abyss, save that they are unfathomably old, terrifyingly powerful, and they will not stop.
Elder songs tell of a great pantheon that once ruled over all of creation. Eventually, their era passed and their bodies decayed, but this was not the end. Some say their spirits rejected death and clung to their physical forms out of fear or stubbornness. Others believe eldritch spirits wrested control of their corpses and now puppeteer them like hermit crabs.
Regardless, the Old Gods have become grotesque, hollow shadows of whatever they once were, bent on unmaking all of their works. Including what remains of humanity.