Check the listing for details. Invisible Sun RPG ~ Book M ~ Monte Cook ~ OEJ. Condition: Used. Listed at 34.99 USD. Scratch & dent. New. Binding intact. Book has creasing along the spine on the front and back . Perfectly usable, just a little ugly! Even it's name is secret. Some say it 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, Book M is one of the rarest and most sought-after grimoires. It’s whispered to contain otherwise 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 artifacts of great power.