From the back of the book: This sourcebook for the Advanced Fighting Fantasy RPG provides a whole new way of playing the game. Take on the role of a lowly Demon, brought to Titan for some nefarious purpose. Try and avoid those foul Heroes out to get you. Gain Essence and reform as something more powerful... Includes: Demon character creation New and updated game rules 42 different Demon forms New magic items Rules for Demonologists - including new spells and rituals Guidance on Demon-focused campaigns An introductory adventure