Fourth Wing Books Lead Amazon's 2025 Kindle Best Sellers

The Empyrean series has surged to new heights with the recent 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 gained immense popularity starting with the debut 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 infectious appeal of Rebecca Yarros' storytelling. Her unique blend of fantasy and romance has captivated a wide audience, and with Amazon greenlighting a "Fourth Wing" TV series, the Empyrean series has the potential to eclipse even the iconic Harry Potter franchise in popularity, provided it capitalizes on its current momentum.

The Physical Editions Are Popular Too

Onyx Storm (Deluxe Limited Edition)

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While the Empyrean series dominates the Kindle charts, it also holds strong on Amazon's top-selling physical books list for 2025. Both the deluxe and standard editions of "Onyx Storm" rank in the top 10, with "Fourth Wing" maintaining its position in the top 25. The only book to outrank "Onyx Storm" recently is Suzanne Collins' latest addition to the Hunger Games series. However, as more readers discover the series starting with "Fourth Wing," we might see a shift in rankings before the end of 2025.

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 with a Kindle Unlimited subscription. To get started, simply log into your Kindle account and download these titles before they are potentially removed from the subscription service.