The Advanced Dungeons & Dragons Dungeon Masters Guide Revised Edition from December 1979, published by TSR, Inc., is a classic role-playing game book authored by Gary Gygax. This 238-page trade paperback, with illustrations by various artists, is the authoritative guide for Dungeon Masters looking to create immersive fantasy worlds for their players to explore and engage in epic adventures. With a focus on the Dungeons & Dragons brand and the role-playing and fantasy genre, this book is a must-have for fans of the game looking to enhance their gaming experience.