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

The Empyrean series, with its latest addition, *Onyx Storm*, released earlier this year, has soared to new heights by topping Amazon's Kindle best sellers list for 2025. The series gained massive popularity following the release of *Fourth Wing* in 2023, largely fueled by the viral influence of Booktok. Since then, this captivating romantasy series has not only dominated Kindle charts but also secured its place among the top sellers across various platforms.

Amazon best selling kindle books

The release of *Onyx Storm* has successfully drawn in a wave of new readers, showcasing the infectious nature of Rebecca Yarros' storytelling. With a perfect blend of fantasy and romance, the series appeals to a wide audience. The announcement of a *Fourth Wing* TV series being greenlit at Amazon further amplifies its potential to eclipse even the iconic Harry Potter franchise in popularity, provided the series continues to captivate its audience.

The Physical Editions Are Popular Too

### Onyx Storm (Deluxe Limited Edition)

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The Empyrean series not only leads the Kindle charts but also ranks high on Amazon's list of top-selling physical books for 2025. Both the deluxe and standard editions of *Onyx Storm* are within the top 10, while *Fourth Wing* holds strong in the top 25. The release of Suzanne Collins' new *Hunger Games* book has pushed *Onyx Storm* to the second spot on the fiction list, but with more readers discovering the series through *Fourth Wing*, its position could shift again before the year ends.

Fourth Wing and Iron Flame are Part of Kindle Unlimited

### Kindle Unlimited

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For those eager to dive into the Empyrean series, the first two books, *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 before they potentially leave the subscription service, providing a cost-effective way to explore the enchanting world of the Empyrean series.