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 influence of Booktok. Since then, this romantasy series has captured the hearts of readers worldwide, dominating best seller charts across various platforms.
The release of *Onyx Storm* has drawn a fresh wave of readers to the series, highlighting the captivating blend of fantasy and romance crafted by Rebecca Yarros. This viral success has only been amplified by the announcement of a *Fourth Wing* TV series greenlit at Amazon, positioning the Empyrean series to potentially surpass even the iconic Harry Potter franchise in popularity.
The Physical Editions Are Popular Too
Onyx Storm (Deluxe Limited Edition)
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Not only does the Empyrean series reign supreme on 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 nestled in the top 10, with *Fourth Wing* maintaining its position in the top 25. The recent release of Suzanne Collins' new *Hunger Games* book has nudged *Onyx Storm* to the second spot on the fiction list, but with an influx of new readers discovering *Fourth Wing*, this ranking could shift before the year's end.
Answer See ResultsFourth 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 through a Kindle Unlimited subscription. Subscribers can easily access these titles by logging into their Kindle account and downloading them before they potentially leave the subscription service.
