So secret even its name is a mystery. Some say the name comes from the Sodality of Vryn, which identifies thirteen currents of magic and gives each a letter designation. M is the 13th and most powerful. Others say the title refers to the original writer of the book, while still others believe it stands for mystery, or perhaps most simply and obviously magic. Whatever the source of its name, the coveted Book M is whispered to contain unknown spells, incantations, rituals, charms, hexes, and more. Plus potions, amulets, bezoars, spiritstones, and madstones, as well as other physical ephemera. Within its pages a vislae might even discover previously unknown artifacts to aid in the pursuit of the secrets of reality. Hardcover book plus 200 cards all in a highly desirable slipcase. Slipcase will hold the next three Invisible Sun supplements, encouraging future purchases to fill it out! Magic (think Doctor Strange, rather than 6 d6 fireball) is what Invisible Sun is all about and this supplement is all about magic!