This sequel to The RUINS OF UNDERMOUNTAIN contains the 128-page Campaign Guide to Undermountain: The Deep Levels, a 32-page adventure booklet, a 16-page MONSTROUS COMPENDIUM booklet, four full-color, poster-size maps of the levels described in this boxed set, and a set of eight DM Assistance Cards to aid in trapping the corridors and rooms of this, the greatest and most dangerous dungeon in all the Realms.