From the back of the book:
A guide to survival in the realms below.
Dungeons are an integral part of fantasy gaming, but there's far more to them than just stone corridors and random monsters. This book contains a plethora of tips, tricks and rules to help make your dungeons the stuff of legend. It includes essays on design and construction, overviews of different dungeon types, player advice for surviving underground perils, and a host of new rules, spells, monsters, and magic items.