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*, catapulting all three books to the top of Amazon's Kindle best sellers list for 2025. The series' popularity surged when *Fourth Wing* was first published in 2023, gaining traction largely thanks to the influential Booktok community. Since then, this captivating romantasy series has not only topped Kindle charts but has also become a dominant force across most best seller lists.

Amazon best selling kindle books

The release of *Onyx Storm* has drawn a fresh wave of readers to the series, highlighting the viral appeal of Rebecca Yarros' storytelling. Her unique blend of fantasy and romance has captivated a wide audience, and with the announcement of a *Fourth Wing* TV series greenlit at Amazon, the Empyrean series is poised to potentially outshine even the iconic Harry Potter franchise, provided it continues to play its cards right.

The Physical Editions Are Popular Too

Onyx Storm (Deluxe Limited Edition)

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While the Empyrean series dominates the digital realm with its Kindle success, it also boasts a strong presence in Amazon's top-selling physical books list for 2025. Both the deluxe and standard editions of *Onyx Storm* hold positions in the top 10, with *Fourth Wing* maintaining a spot in the top 25. The only recent shift saw *Onyx Storm* slip to the second spot behind Suzanne Collins' new Hunger Games release. However, with an increasing number of readers discovering the series through *Fourth Wing*, it's possible that *Onyx Storm* could reclaim the top position 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, 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 log into their Kindle accounts to download these titles before they potentially leave the subscription service.