Kel'Thuzad, once a sorcerer of the Kirin Tor of Dalaran, is the chief lieutenant of the powerful Lich King. He rules over the Dragonblight from his citadel of Naxxramas. He was originally voiced by Michael McConnohie but the current voice actor is unknown. He is the final boss of the re-tuned raid dungeon Naxxramas in Wrath of the Lich King.