Marduk is the chief antagonist of the https://vanillawowdb.com/?quest=5721"">(Quest #5721) . He spawns late in the battle, and appears just long enough to corrupt https://vanillawowdb.com/?npc=10937"">(NPC #10937) , transforming him into, appropriately enough, https://vanillawowdb.com/?npc=10938"">(NPC #10938) . You won't have a chance to kill him during this battle, but you can take him on in https://vanillawowdb.com/?maps=2057"">Scholomance where he appears as https://vanillawowdb.com/?npc=10433"">(NPC #10433) .