Harbinger Skyriss is one of the qiraji entities that the naaru kept locked up within the Arcatraz. He is a servant of the Old Gods and seeks to usher in his masters' vision of conquering all of the worlds in the universe. His plans were surprisingly rewarded when he was picked up by the naaru. He must have corrupted Warden Mellichar into releasing all the prisoners in the Arcatraz. Many of the mini-bosses, as well as Skyriss himself, are based on classic World of Warcraft raid bosses.