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Fourth Wing fans wasted no time. Bestselling author Rebecca Yarros announced her upcoming companion collection, titled Threshing Day, a week ago, and it’s already climbed to No. 1 on Amazon’s most-sold fiction chart.
For the week of July 19, 2026, Yarros’ highly anticipated companion collection, slated for a Sept. 29 release date, bumped Allen Levi’s Theo of Golden from the pinnacle spot.
A collection of short stories, Threshing Day will feature 13 tales told from the perspectives of beloved characters and their dragons at Basgiath War College. Yarros announced the new project on Instagram on July 15.
"Welcome to Conscription Day, Cadets!" she wrote. "I’m thrilled to share the title and cover of my next book (not book four!) in the Empyrean series: Threshing Day! … If you’re looking for copies outside the U.S., keep an eye on my foreign publishers’ social media for updates about their release dates."
She added, "I hope this gives you a fun trip back to Basgiath while I’m writing book four! So grab your leathers… The dragons are waiting! On sale September 29, 2026."
According to Rolling Stone, the book will also feature 16 original full-color illustrations by Joe Requeza.
“The deluxe first edition is exclusive to the U.S. and Canada and became a No. 1 bestseller before its title and cover were even revealed,” the outlet wrote.
Renowned for her intricate world-building, Yarros has created a mystical realm in which a 20-year-old woman named Violet Sorrengail is thrust into a brutal war college. There are dueling kingdoms, dragon riders, and venin villains. And, of course, romance.
“One of the things I love to play with is that absolute power corrupts absolutely, and that when you want magic, and you can’t have it because a dragon or a griffin hasn’t chosen you, what will you pay for it?” she told Variety about her series.
Threshing Day, published courtesy of Red Tower Books, is the latest installment of the bestselling Empyrean franchise. Dubbed “Book 3.5,” it comes after the first three romantasy stories—Fourth Wing, Iron Flame, and Onyx Storm—but rather than continue the series through Violet's point of view, Threshing Day dives into the lives of Yarros’ fan-favorite characters.
“Thirteen unforgettable stories. One Legendary Day. The bond that changes everything,” the synopsis reads on the author’s official website.
As for the final two books in the pentalogy, those are on the way. Though the series was initially structured for three books, Yarros reportedly needed five to do her full story justice.
Related: Best-Selling Author’s New Novel Rises Among Most-Read Fiction Books on Amazon
