Tidebreakers Officially Announced, Coming October 2027

Brandon Sanderson’s Cosmere universe has expanded substantially in 2026 already, with several new updates giving fans something to look forward to across an array of media. On the publishing side, Sanderson has already turned his attention back to Ghostbloods, with the second draft of the first book currently underway ahead of its planned 2028 release.

At the same time, his long-awaited jump to live action is finally becoming a reality, with Sanderson recently completing the first draft of his Mistborn screenplay, while The Stormlight Archive is also being developed as a 10-episode Apple TV series that he plans to help write. Both are part of Apple’s wider deal to bring the Cosmere to the screen, with Sanderson retaining unusually extensive creative involvement.

Perhaps the most exciting addition to Sanderson’s universe, however, is Brotherwise Games‘ fresh slate of updates for the Cosmere RPG, including the upcoming Mistborn campaign setting and ambitious plans stretching well into 2027 and beyond, including the brand-new announcement of Stormlight: Tidebreakers.

Stormlight Tidebreakers expansion Cosmere RPG

Fans of Brotherwise Games’ Cosmere RPG will want to keep an eye on the upcoming launch of Tidebreakers, a newly announced follow-up campaign for the beloved Stonewalkers levels 1–7 campaign that released back in 2025. Tidebreakers is the next-tier campaign for levels 10–16, where players will head to the high seas and the deep jungle in the Reshi isles, covering the events of Books 3–5 in The Stormlight Archive, Oathbringer, Rhthym of War, and Wind and Truth.

The announcement comes alongside a massive update from Brotherwise on its various Cosmere-related projects, including coverage on the launch of the Mistborn: The Well of Acension tabletop game and Mistborn: The Deckbuilding Game at Gen Con last month. While details about Tidebreakers are still a bit sparse at the moment, it’s “expected to release at retail in October 2027,” with Brotherwise planning to run playtests in the coming months and provide updates along the way.

Brotherwise also offered some context on the level gap between campaigns, which was actually left there by design according to the panel discussion at Gen Con. The intention is to “have your PCs go on a homebrew adventure in between campaigns, have them level up ‘offscreen,’ OR you can play Showdown in Shadesmar,” a digital stretch goal that was unlocked during the Kickstarter campaign that backers will receive for free in 2027.

If you haven’t had a chance to dive into the Cosmere RPG yet, now is the perfect time to get caught up ahead of the official launch of Tidebreakers next year. With both the Stormlight and Mistborn Campaign Settings officially becoming available this year, there’s a ton of content to explore ahead of 2027.