From publisher blurb: Powers of Corruption! Long have tales spoken of inhuman evils, entities of corruption and ruin with countless names and faces. Their abilities are incredible, their intentions nightmarish… And now, their secrets revealed! Spheres Bestiary: Fiends of Cosmos introduces players to 18 mighty fiendish foes ranging from the lowly Imp to the corrupting Nightmare Prophet to the alien Elemental Cyst to the mighty Abyss-born Tyrant. Also contained within this book are numerous new feats for outsiders and seven expansive templates for creating new fiends of your own design. Seize upon this archive of strange powers and witness what the Fiends of the Cosmos truly have to offer.