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

The Empyrean series has taken the literary world by storm, with the recent release of "Onyx Storm" catapulting all three books to the top of Amazon's Kindle best sellers list for 2025. The series gained initial traction with the publication of "Fourth Wing" in 2023, largely due to the influence of Booktok. Since then, this captivating blend of romance and fantasy, known as romantasy, has surged in popularity, consistently topping best seller charts.

The viral success of Rebecca Yarros' writing is evident in the influx of new readers drawn to the series following the release of "Onyx Storm." Her storytelling masterfully combines elements of fantasy and romance, appealing to a wide audience. With a "Fourth Wing" TV series now greenlit by Amazon, the Empyrean series is poised to potentially surpass even the iconic Harry Potter franchise in popularity, provided it capitalizes on its momentum.

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, with "Fourth Wing" securing a spot in the top 25. The only book to momentarily eclipse "Onyx Storm" is the new release from Suzanne Collins' Hunger Games series. However, with an increasing number of readers discovering the series through "Fourth Wing," "Onyx Storm" may reclaim its position as the top fiction book 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 eager 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 easily access and download these titles from their Kindle account, offering a convenient way to start the Empyrean journey before the books potentially leave the subscription service.