The Empyrean series has skyrocketed to fame, with the latest addition, Onyx Storm, released earlier this year, propelling all three books to the top of Amazon's Kindle best sellers list for 2025. The series first gained massive traction in 2023 with the release of Fourth Wing, largely fueled by the viral phenomenon of Booktok. Since then, Rebecca Yarros' blend of fantasy and romance—termed "romantasy"—has captivated a wide audience, driving the series to dominate bestseller charts across the board.
The Physical Editions Are Popular Too
Onyx Storm (Deluxe Limited Edition)
1See it at AmazonSee it at Barnes and NobleSee it at TargetNot only does the Empyrean series reign supreme on Kindle charts, but it also claims a significant presence on Amazon's top selling physical books list for 2025. Both the deluxe and standard editions of Onyx Storm secure spots in the top 10, while Fourth Wing continues to hold strong within the top 25.
Onyx Storm has only recently slipped to the second position on the fiction list following the release of Suzanne Collins' new Hunger Games book. However, with an influx of new readers discovering the series through Fourth Wing, it's possible Onyx Storm could reclaim its position before the end of 2025.
AnswerSee ResultsFourth Wing and Iron Flame are Part of Kindle Unlimited
Kindle Unlimited
35See subscription options.See it at AmazonFor 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 through a Kindle Unlimited subscription. Subscribers can easily access and download these titles before they potentially leave the service.
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