Dragonsteel

Dragonsteel refers to an unpublished series set on Yolen that has been called the prequel to the cosmere. It takes place first chronologically and will feature the Shattering, Hoid's backstory, and dragons. One reason Brandon has not prioritized this series, though, is that he doesn't want readers to feel that they have to read his other books in order to understand what is happening, and he probably won't publish Hoid's story until it becomes relevant.

He plans to rewrite and publish Dragonsteel at some point after the full arc of the Stormlight Archive has been completed.

In 2019, Brandon published an updated outline of the cosmere in which Dragonsteel was reduced from seven books to three. By this point, significant parts of the original Dragonsteel story arc had been used elsewhere, and so the series was envisioned as a tighter story about Hoid's origins and the Shattering. A rewritten Dragonsteel series is still not planned for release until after book 10 of The Stormlight Archive.