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

The Empyrean series has taken the literary world by storm, with the latest release, *Onyx Storm*, propelling all three books to the top of Amazon's Kindle best sellers list for 2025. The series' surge in popularity began with the release of *Fourth Wing* in 2023, largely fueled by the viral sensation of Booktok. Since then, this captivating romantasy series has not only dominated the Kindle charts but has also become a staple on most best seller lists.

The release of *Onyx Storm* has attracted a wave of new readers, showcasing the viral appeal of Rebecca Yarros' storytelling. Her unique blend of fantasy and romance has captivated a wide audience, making the series a must-read. With the announcement of a *Fourth Wing* TV series in development at Amazon, the Empyrean series is poised to potentially surpass even the iconic 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 continues to dominate 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* rank within the top 10, with *Fourth Wing* maintaining 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 influx of new readers starting with *Fourth Wing*, the rankings could shift once more before the year's end.

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 through a Kindle Unlimited subscription. Subscribers can easily access and download these titles from their Kindle account, offering a perfect opportunity to catch up before the books potentially leave the subscription service.