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

The Empyrean series has soared to new heights with the release of "Onyx Storm" earlier this year, propelling all three books to the top of Amazon's Kindle best sellers list for 2025. The series' surge in popularity began with the debut of "Fourth Wing" in 2023, largely fueled by the viral sensation of Booktok. Since then, Rebecca Yarros' romantasy series has captivated readers worldwide, dominating bestseller charts with its perfect blend of fantasy and romance.

Amazon best selling kindle books

The release of "Onyx Storm" has not only attracted new readers but also highlighted the viral power of Yarros' storytelling. As the series continues to enthrall a diverse audience, the announcement of a "Fourth Wing" TV series on Amazon has set the stage for the Empyrean saga to potentially eclipse even the legendary Harry Potter franchise in popularity.

The Physical Editions Are Popular Too

Onyx Storm (Deluxe Limited Edition)

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While dominating the Kindle charts, the Empyrean series 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 its place in the top 25. Only the release of Suzanne Collins' new Hunger Games book has pushed "Onyx Storm" to the second spot on the fiction list. However, with an influx of new readers discovering the series through "Fourth Wing," it's possible we'll see a shift before the year ends.

Fourth Wing and Iron Flame are Part of Kindle Unlimited

Kindle Unlimited

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For those looking to dive into the Empyrean series, the first two books, "Fourth Wing" and "Iron Flame," are available for free on the Kindle app with a Kindle Unlimited subscription. This provides an excellent opportunity for new readers to start the series before the titles are removed from the subscription service.