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

The Empyrean series has surged to the top of Amazon's Kindle best sellers list for 2025, largely driven by the recent release of "Onyx Storm" earlier this year. Since the debut of "Fourth Wing" in 2023, which gained immense popularity through Booktok, this romantasy series has captivated readers, securing its place at the pinnacle of best seller charts.

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 a broad appeal, drawing in a diverse readership. With the announcement of a "Fourth Wing" TV series in development at Amazon, the Empyrean series is poised to potentially surpass the popularity of the Harry Potter franchise, given the right strategy.

The Physical Editions Are Popular Too

Onyx Storm (Deluxe Limited Edition)

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While the Empyrean series reigns supreme on Kindle charts, it also holds strong positions 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, with "Fourth Wing" not far behind in the top 25. The only book to edge out "Onyx Storm" as the top fiction release is the new Hunger Games novel by Suzanne Collins. However, with more readers discovering the series through "Fourth Wing," the rankings could shift again before the year ends.

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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 these titles by logging into their Kindle account and downloading the books before they are potentially removed from the subscription service.