Armies of the Abyss: Book of Fiends, Vol. 2 (d20 System)
A perfect companion piece to Legions of Hell and surpasses that book in both design and content. Style/Substance: Excellent! --Morgan Davey, RPG.net, April 16, 2002[T]he creatures are interesting and have abilities and techniques distinct...from that of the demons in the Monster Manual. --Alan Kohler, D20 Reviews, April 20, 2002