Erebus

Erebus, also known as Erebos, is the primeval god of darkness and chaos and is the one responsible for the corruption and evilness of Hades. He spread mists upon the heavens, turning dreams into nightmares. Later in life, the darkness has possessed Hades and turned him into the dark god of dead. He, Hades and Cronus have plotted to release the titans and take over the Olympus. However, when the titans were released from Tartarus, Hades pushed him down into Tartarus.