A complete setting for play of AD&D is contained herein. This module can be played alone, as the first part of a series of three modules (with Shrine of the Kuo-Toa, D2, and Vault of the Drow, D3), or as the fourth part of a continuing series of modules which form a special progressive campaign scenario (modules G1, G2, G3, D1, D2, D3, and Q1).

This module contains background information, a large-scale referee's map with a matching partial map for players, referee's notes, special exploration and encounter pieces, a large map detailing a cavern area, encounter and map matrix keys, and an additional section pertaining to a unique new creature for use with this module and the game as a whole.