The Empyrean series has soared 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' popularity exploded with the debut of *Fourth Wing* in 2023, largely fueled by the viral sensation of Booktok. Since then, this captivating romantasy series has consistently topped best seller charts, captivating a vast audience with its enchanting blend of fantasy and romance.
The release of *Onyx Storm* has drawn a flood of new readers to the series, showcasing the irresistible allure of Rebecca Yarros' writing. Her unique mix of fantasy and romance has a broad appeal, enchanting readers across various demographics. The announcement of a *Fourth Wing* TV series being greenlit at Amazon further amplifies the series' potential to eclipse even the iconic Harry Potter franchise, given the right execution.
The Physical Editions Are Popular Too
Onyx Storm (Deluxe Limited Edition)
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Not only does the Empyrean series dominate the Kindle charts, but it also holds strong on Amazon's top-selling physical books list for 2025. Both the deluxe and standard editions of *Onyx Storm* are firmly in the top 10, while *Fourth Wing* remains a stalwart in the top 25. The only book to momentarily eclipse *Onyx Storm* on the fiction list is Suzanne Collins' latest addition to the Hunger Games series. However, with an influx of new readers discovering the series through *Fourth Wing*, *Onyx Storm* could reclaim its top spot before the end of 2025.
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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 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. Subscribers can easily log into their Kindle account and download these titles before they are potentially removed from the subscription service.
