Rebecca Yarros plans to launch upcoming novella titled Threshing Day on 29 September 2026. It belongs to the Empyrean series and connects with the Fourth Wing saga. Piatkus will manage publication. Media outlets said the title after Yarros shared it herself. No details on the story or the book's cover has surfaced yet. Fans have been waiting for the next entry of the bestselling series. The announcement came after a quiet spell by Yarros. The novella is set as a supplemental addition, but not a full-length book.