The Planewalker's Handbook is a supplement for the Dungeons & Dragons role-playing game published by TSR. It provides additional content and rules for players who want to explore the planes of existence in the D&D multiverse. The handbook is dedicated to the Planewalkers, characters who are skilled at navigating through the planes and manipulating their fabric. With in-depth rules and lore, this handbook offers a unique and immersive experience for players looking to enhance their D&D adventures.