From publisher blurb: Mine is the Power! Power. Humans have always sought it. Clerics pray for it. Wizards study for it. Warlocks take it. Introducing the Warlock class for your Old-School RPGs. Four new warlock pacts: Chaos, Cosmic, Death, and Dragon. 78 Warlock spells including Cantrips. 13 new spells for clerics, druids, illusionists, and magic-users each. 55 Warlock Invocations, the ultimate expression of their power! Magic items and warlock patrons. Fully compatible with Old-School Essentials and other Basic-Era games. Fully compatible with other witch books from The Other Side.