Book of Fiends, Volume Two: Armies of the Abyss is a 2002 supplement for d20 System role-playing games published by Green Ronin Publishing.
Contents Book of Fiends, Volume Two: Armies of the Abyss is a supplement in which a demon‑focused sourcebook details dozens of fiends and their princes, introduces the demon‑bound thaumaturge class, and provides extensive lore, spells, and tools for bringing the chaotic horrors of the Abyss into a campaign.https://index.rpg.net/display-entry.phtml?mainid=6999
Reviews Pyramid Fictional Reality #9 d20Zine #1 (June, 2002)https://index.rpg.net/display-entry.phtml?mainid=11935
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