This D&D supplement presents a refreshing new take on dungeon adventures. It shows Dungeon Masters how to inject excitement, innovation, and thrilling adventure into their dungeons. New rules for encounter traps allow DMs to build deadly snares to catch the unwary. For players, the factotum class is a cunning wanderer, a jack-of-all-trades who can cope with anything the dungeon throws at him. New equipment, feats, and prestige classes give adventurers the tools they need to survive the dark beneath the earth.