The Empyrean series has taken the literary world by storm, with the latest release, *Onyx Storm*, earlier this year propelling all three books to the top of Amazon's Kindle best sellers list for 2025. The series' rise to fame began with the release of *Fourth Wing* in 2023, largely fueled by the viral sensation known as BookTok. Since then, this romantasy series has captivated readers worldwide, securing its place at the top of numerous bestseller charts.
The release of *Onyx Storm* has not only attracted new readers but also highlighted the viral appeal of Rebecca Yarros' storytelling. Her unique blend of fantasy and romance has enchanted a diverse audience. With the announcement of a *Fourth Wing* TV series in development at Amazon, the Empyrean series is poised to potentially surpass even the iconic Harry Potter franchise in popularity, provided it capitalizes on this momentum effectively.
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 a spot in the top 25. The only book to momentarily eclipse *Onyx Storm* is Suzanne Collins' new addition to the Hunger Games series. However, with an influx of new readers discovering the series through *Fourth Wing*, *Onyx Storm* could reclaim its position as the top fiction book before the year ends.
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 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 access these titles by logging into their Kindle account and downloading them before they potentially leave the subscription service.
