Anub'arak is the final boss in the Trial of the Crusader. Upon defeating the Twin Val'kyr, the The Lich King himself makes a dramatic showing, after which the floor of the coliseum is shattered. The raid will fall into the Icy Depths below, where they will face the final challenge.Tribute ChestThe loot from the encounter in the Trial of the Grand Crusade can be found in Argent Crusade Tribute Chest.