Pathfinder Roleplaying Game: Book of the Damned (PFRPG)
Pathfinder RPG Book of the Damned includes:
Descriptions for dozens of archdevils, demon lords, Horsemen of the Apocalypse, and other fiendish divinities, including the foul boons they grant to their most devoted followers.
Explorations of otherworldly fiendish realms, including the infernal reaches of Hell, the death-haunted expanses of Abaddon, and the nightmare depths of the Abyss.
Several brand-new monsters to fill out the ranks of all 11 of the fiendish races, from sinister classics such as demons and devils to new favorites like asuras and sahkils.
New blasphemous rituals, magic items, powerful artifacts, and spells to arm your villains with or for heroes to discover and defy.
Three fiend-focused prestige classes, ready to vex and terrify adventurers who dare stand against their plots.
An extensive collection of in-world excerpts from the sinister pages of the Book of the Damned itself.
... and much, much more!
Paizo source usable under Community Use