Fourth Wing Books Top Amazon's Kindle Best Sellers in 2025

The Empyrean series has surged to the top of Amazon's Kindle best sellers list for 2025, following the release of "Onyx Storm" earlier this year. The series, which includes three books, gained massive popularity starting with the 2023 release of "Fourth Wing," largely fueled by the influence of Booktok. Since then, the romantasy genre has seen a significant boost, with the Empyrean series leading the charge across various bestseller charts.

The viral success of Rebecca Yarros' writing, which skillfully blends fantasy and romance, has attracted a diverse readership. The recent release of "Onyx Storm" has not only drawn in new fans but also highlighted the series' potential to become even more popular than the Harry Potter franchise, especially with the announcement of a "Fourth Wing" TV series in development at Amazon.

The Physical Editions Are Popular Too

Onyx Storm (Deluxe Limited Edition)

1. See it at Amazon
2. See it at Barnes and Noble
3. See it at Target

While dominating the Kindle charts, the Empyrean series also holds a strong position on Amazon's top-selling physical books list for 2025. Both the deluxe and standard editions of "Onyx Storm" rank within the top 10, and "Fourth Wing" remains firmly in the top 25. The only recent shift occurred with the release of Suzanne Collins' new Hunger Games book, which pushed "Onyx Storm" to the second spot on the fiction list. However, with an increasing number of readers discovering the series through "Fourth Wing," there's potential for "Onyx Storm" to reclaim its lead before the year ends.

Fourth Wing and Iron Flame are Part of Kindle Unlimited

Kindle Unlimited

35. See subscription options.
36. See it at Amazon

For those looking to dive into the series, "Fourth Wing" and "Iron Flame" are currently available for free on the Kindle app through a Kindle Unlimited subscription. Subscribers can log into their Kindle account to download these books before they potentially leave the subscription service, offering a perfect entry point into the captivating world of the Empyrean series.