Cosmere RPG: Stormlight HandbookThe Stormlight Handbook is a 392 page hardcover rulebook for the Cosmere Roleplaying Game. It includes all the rules needed to build characters and adventures in the world of Roshar from Brandon Sandersons acclaimed The Stormlight Archive series. Familiar Ruleset. The systems core mechanic is simple: roll a 20 sided die, add a relevant skill, and try to beat a certain difficulty number. The Plot Die. To raise the stakes on dramatic or risky rolls, add