Rebecca Yarros, author of the widely popular fantasy romance book series Fourth Wing (The Empyrean series), announced the title of a new book called Threshing Day, which will be released on September 29, 2026.

Yarros originally revealed the hotly rumored book without a title, but with the ability to preorder back in April. Fans instantly speculated on what it was; Yarros had disclosed it was an "Untitled Empyrean" book, but that it was not book 4. Despite the lack of details, the preorders shot the book to #2 on Amazon.

It turns out the official title reveal was being held for Conscription Day, July 15, which is a day in the series where cadets need to prove themselves by surviving through a life-or-death challenge in order to become dragon riders.

Yarros shared the announcement and details in an Instagram post, stating the book will contain a collection of 13 stories from fan-favorite characters during their Threshing Day (the day they get their dragons).

The deluxe edition will have 16 original art pieces in full color by the artist Joe Requeza.

Yarros also confirmed Xaden's story – one of the main characters of the series, which has been a long-time POV request from readers – will be included in the book, as well as published on her website.

Yarros confirmed she is still in the process of writing book 4, and readers are waiting patiently for any release date news. Book 1 in The Empyrean series, Fourth Wing, was published on May 2, 2023. Book two, Iron Flame, came out on November 7, 2023, and book 3, Onyx Storm, released January 21, 2025.

Due to the bursting popularity of The Empyrean series and the fantasy romance genre in general, a Fourth Wing TV series is in the works at Amazon MGM Studios and Michael B. Jordan’s Outlier Society. It's unknown if any character details from Threshing Day will be included in the show.

For more on The Empyrean series, check out our Fourth Wing hub with everything from latest news to how to buy the books to cool board games to play with fellow dragon riders!

For those looking to get your gloved hands on Threshing Day, you can preorder the book right here, which will release in stores on September 29, 2026.

Jessie Wade is Associate Director of Editorial Programming at IGN. You can find her playing cozy games on her Switch or watching the latest rom-com and drama shows, as well as getting lost in way too many fantasy romance books. She would be a dragon rider at Basgiath War College (even though a Scribe also sounds cool).