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Fiendish Codex I: Hordes of the Abyss is an accessory for the 3.5th-edition of Dungeons & Dragons® ruleset.

Raw Chaos and Pure Evil

Out of the maelstrom of chaos the demons came—a primordial horde of perverse souls consumed by hatred. They are as ancient and infinite as the multiverse itself. Even the bottomless Abyss could not contain their malice, and so they spread out across the planes, corrupting and destroying everything in their path. No living soul is beyond their reach, and with each conquered soul their numbers grow. What can stand against such a terrifying onslaught?

This supplement for the D&D® game presents the definitive treatise on demons and their unspeakable home plane. Along with information about the physiology, psychology, society, and schemes of demonkind, you’ll find feats, spells, items, and tactics commonly employed by demons and those who oppose them. This book also provides detailed information on various demons, demon lords, and Abyssal layers.


  • Introduction
  • Chapter 1: Demonic Lore
  • Chapter 2: Demons
  • Chapter 3: Demon Lords
  • Chapter 4: Trafficking with Demons
  • Chapter 5: Into the Abyss
  • Appendix I: Lords of the Abyss
  • Appendix II: Layers of the Abyss
  • Appendix III: Index of Demons


The first chapter explains a number of well known aspects of demons, including their physiology, their interactions on the Material Plane, the roles they fit into, and how possession works. Also details the Black Scrolls of Ahm.

Chapter two discusses the difference between the three main subtypes of demon: loumara, obyrith, and tanar'ri. Also includes information on sixteen different types of demons.

The third chapter explores fourteen demon lords. Their statistics are given at lower Challenge Ratings than in previous books such as Book of Vile Darkness. It also provides tips on advancing the demon lords so that they can be as powerful as you like.

Chapter four discusses the various ways of interacting with demons, from fighting them to allying with them. This chaper includes game statistic information for feats and magic spells related to demons and demon hunting.

The final chapter features a general overview of the Abyss, and includes descriptions for fifteen layers of the Abyss (including the realms of the above-mentioned demon lords).

Included in the accessory are three appendices. the first one features a list of all known demon lords; the second one features a list of all known layers of the Abyss; and the final one features a list of all known types of demon, sorted by their Challenge Ratings, which are updated to 3.5. It also includes the books from which they originated.



BaphometDagonDemogorgonFraz-Urb'luuGraz'ztJuiblexKostchtchieMalcanthetObox-obOrcusPale NightPazuzuYeenoghuZuggtmoy





  • Designers: Ed STark, James Jacobs, Erik Mona
  • Editors: Christopher Perkins, Michelle Lyons, Cindi Rice, Penny Williams
  • Editing Manager: Kim Mohan
  • Design Manager: Christopher Perkins
  • Development Manager: Jesse Decker
  • Director of RPG R&D: Bill Slavicsek
  • Production Managers: Josh Fischer, Randall Crews
  • Senior Art Director D&D: Stacy Longstreet
  • Art Director: Mari Kolkowsky
  • Cover Art: Sam Wood
  • Interior Artists: Thomas M. Baxa, Carl Critchlow, Erik Gist, Ralph Horsley, William O'Connor, Ted Pendergraft, Wayne Reynolds, Anne Stokes, Arnie Swekel, Franz Vohwinkel
  • Cartographers: Jason Engle, Kyle Hunter
  • Graphic Designers: Mari Kolkowsky, Yasuyo Dunnett
  • Graphic Production Specialist: Erin Dorries
  • Image Technician: Bob Jordan


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