An adventure for four 18th level characters that involves a special level of the famous dungeon. Includes non-OGC material from Underdark, Complete Warrior, Heroes of Horror, and Complete Arcane. New material includes the magic items Aeltoqq's phylacerty, astral gate, golden rod of the ancients, and black and red pellets of arcane augmentation, Celestian's impervious containment, and Yan-C-Bin's hedge.