This 144-page edition does contain the Cthulhu and Melnibonéan mythos as described in some of the reviews. Deities & Demigods Cyclopedia provides the Dungeon Master with gods, heroes and monsters from myth, fiction and legend for use in rounding out an Advanced D&D campaign. Within this book are fifteen pantheons of divinities, each profusely illustrated. Also included are new material on clerics' conduct and their relationships with their deities, information on character mortality and immortality, detailed and more!