From the introduction: This book was developed as a collaborative exercise on the Dragonsfoot forums to describe the rest of the "Depths of the Earth" from dungeon modules D1-3 by Gary Gygax, and comrpises those areas illustrated on the map but not detailed in the modules themselves. User summary: See also: D1: Descent Into the Depths of the Earth D2: Shrine of the Kuo-Toa D3: Vault of the Drow