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 captured the hearts of a wide audience, blending fantasy and romance in a way that has kept readers enchanted and coming back for more. The recent announcement of a *Fourth Wing* TV series greenlit by Amazon adds to the excitement, positioning the Empyrean series to potentially outshine even the iconic Harry Potter franchise if 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 dominates the Kindle charts, it also holds a strong position in Amazon's top-selling physical books list for 2025. Both the deluxe and standard editions of *Onyx Storm* rank within the top 10, and *Fourth Wing* remains a steady presence in the top 25. The only recent challenge to *Onyx Storm*'s position as the top fiction book came with the release of Suzanne Collins' new Hunger Games book, which temporarily displaced it to the second spot. However, with an increasing number of readers diving into the series starting with *Fourth Wing*, there's a good chance *Onyx Storm* could reclaim its 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 Empyrean series, the first two books, *Fourth Wing* and *Iron Flame*, are currently available for free on the Kindle app with a Kindle Unlimited subscription. This is the perfect opportunity for new readers to catch up before these titles are potentially removed from the subscription service. Simply log into your Kindle account and download them to start your journey into this captivating world of fantasy and romance.