The Cosmere® RPG is a "living" RPG that will grow as Brandon Sanderson writes new novels and expands his universe. This original system is designed to tell standalone stories in the Stormlight™ or Mistborn® Settings -- or sweeping Worldhopper™ campaigns that move between different worlds and realms!

When our team set out to choose the core system for this RPG, we knew that no existing ruleset would perfectly capture the scope and tone of the cosmere. For example, a 5e-compatible system with rigid classes would not capture the diverse character backgrounds we see in the Cosmere. However, we also wanted to provide a system that would be easy to pitch to new players, one with familiar elements like “roll a d20 and try to get a high number.” Using d20-based mechanics as a foundation meant the team had a common language and strong understanding of the underlying math, allowing us to focus our efforts on the challenge of bringing together multiple worlds, magic systems, and technology levels.

From the earliest stage of system design, the team has known this would be a Cosmere RPG. In developing our core systems, we drafted rough designs for how they would support different magic systems and technology levels. Mistborn development has been underway for most of 2024. The next step for the RPG, whether that’s a Worldhopper or Elantris sourcebook, depends on fan feedback and Brandon’s writing plans.