Archimonde the Defiler is a lord of the Burning Legion, that answers only to Sargeras himself. He was once an eredar of Argus, and one of their leaders alongside Velen and Kil'jaeden, until he was corrupted by Sargeras. He led the Burning Legion's forces on Azeroth during the Third War, and was defeated by several wisps at the Battle of Mount Hyjal. His soul was sent to the Twisting Nether, and after his body regnerated, he traveled through the Black Gate to Hellfire Citadel on an alternate universe Draenor, after being summoned by Gul'dan. Heroes of Azeroth once again defeated him, but with his dying breath, Archimonde banished Gul'dan through the Black Gate to Azeroth, paving the way for the Burning Legion's third invasion of the world.