This softback supplement for the Spire RPG is written in-character as Lysk Thin-Hands-Scratching, a self-obsessed mask-maker to the rich and famous. In the Spire setting, all of the ruling high elf classes and their dark elf servants must wear masks in public at all times, and staying up to date with the latest trends is paramount. The Book of Masks is beautifully illustrated in full color by Iguanamouth and written by Grant Howitt and Christopher Taylor, the authors of the original Spire RPG.

Inside are descriptions, illustrations and rules for 22 masks, such as: The Vizard Intravenous, which allows you to be strung-out on whatever drugs you like all; day due to cunning ampoules and injector ports; The Forevermask, which purports to slow the signs of aging but in fact bombards the; users face with near-fatal levels of radiation; The Coccoon Mask, a full-body lockable suit for unsightly staff members; The Thunderhelm, which has a big gun in it.