An expansion sourcebook for the Dungeons & Dragons fantasy roleplaying game. Discover everything about demons, new mechanics, story hooks, monsters, and much more! The book features 160 full-color pages, a hardcover binding, and is written in English.

More than just a maelstrom of chaos and corruption, the Abyss is an exciting D&D adventure locale for paragon- and epic-level heroes to explore. Within its many layers lurk powerful demon lords and fiendish hordes eager to be unleashed upon unsuspecting worlds. This tome brings demons into the world of D&D, updates classic demons to 4th Edition, provides statistics for various demon lords, and introduces dozens of new horrors from the abyssal depths. It gives Dungeon Masters ready-to-use encounters and mechanics to make demons exciting elements in their home campaigns.