Fourth Wing Books Top Amazon Kindle Best Sellers in 2025

The Empyrean series has taken the literary world by storm, with the latest release, *Onyx Storm*, earlier this year propelling all three books to the top of Amazon's Kindle best sellers list for 2025. The series gained significant traction with the release of *Fourth Wing* in 2023, largely thanks to the influence of Booktok. Since then, Rebecca Yarros' romantasy series has captivated readers, dominating bestseller charts with its perfect blend of fantasy and romance.

Amazon best selling kindle books

The viral success of *Onyx Storm* has attracted a wave of new readers to the series, highlighting the widespread appeal of Yarros' storytelling. With Amazon greenlighting a TV series based on *Fourth Wing*, the Empyrean series has the potential to surpass even the Harry Potter franchise in popularity, provided it capitalizes on this momentum effectively.

The Physical Editions Are Popular Too

### Onyx Storm (Deluxe Limited Edition)

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While the Empyrean series rules the Kindle charts, it also holds a strong position on Amazon's top-selling physical books list for 2025. Both the deluxe and standard editions of *Onyx Storm* are within the top 10, with *Fourth Wing* maintaining its spot in the top 25. The only book to challenge *Onyx Storm*'s dominance is the new release from Suzanne Collins' Hunger Games series, yet with more readers discovering the Empyrean series through *Fourth Wing*, the rankings 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 series, *Fourth Wing* and *Iron Flame* are currently available for free on the Kindle app with a Kindle Unlimited subscription. Subscribers can easily access these titles by logging into their Kindle account and downloading them before they potentially leave the subscription service.