Cosmere RPG Core Book Bundle in SlipcaseSlipcase set includes the core rulebooks needed for running the Cosmere Role Playing Game in the Stormlight Campaign setting. Contents include: The Stormlight Handbook, 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