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' meteoric rise began with the publication of Fourth Wing in 2023, fueled by the viral sensation of Booktok. Since then, Rebecca Yarros' romantasy series has captivated readers, dominating best seller charts across the board.

The release of Onyx Storm has drawn an influx of new readers, underscoring the viral power of Yarros' storytelling. Her perfect blend of fantasy and romance has enchanted a wide audience, and with the announcement of a Fourth Wing TV series at Amazon, the Empyrean series is poised to eclipse even the Harry Potter franchise in popularity, provided it continues to captivate its audience.

The Physical Editions Are Popular Too

Onyx Storm (Deluxe Limited Edition)

1. See it at Amazon
2. See it at Barnes and Noble
3. See it at Target

Beyond its digital success, the Empyrean series also holds a strong presence on Amazon's top selling physical books list for 2025. Both the deluxe and standard editions of Onyx Storm rank in the top 10, while Fourth Wing secures a spot in the top 25. The only book to outsell Onyx Storm currently is the new release from Suzanne Collins' Hunger Games series. However, with more readers diving into the series starting with Fourth Wing, the rankings could shift again 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 series, the first two books, Fourth Wing and Iron Flame, are 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 subscription service.