Fell Legions and insidious plots await in this D&D supplement presenting
the definitive treatise on devils and their malefic home. Along with
information about the physiology, psychology, society, and schemes of the
devils themselves, you'll find feats, spells, items, and tactics commonly
employed by these infernal creatures and those who oppose them. This book
also provides detailed information on various devils, archdevils, and the
layers of the Nine Hells.