The Empyrean series has skyrocketed to fame, with the latest installment, Onyx Storm, released 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 release of Fourth Wing in 2023, largely fueled by the viral influence of Booktok. Since then, this romantasy series has captivated readers, dominating not only Kindle charts but also best seller lists across various platforms.
Amazon best selling kindle booksThe viral success of Rebecca Yarros' writing, blending the perfect mix of fantasy and romance, has drawn in a wide array of readers. The release of Onyx Storm has further expanded the series' reach, showcasing its enduring appeal. With the announcement of a Fourth Wing TV series greenlit at Amazon, the Empyrean series is poised to potentially outshine even the Harry Potter franchise, given the right moves.
The Physical Editions Are Popular Too
#### Onyx Storm (Deluxe Limited Edition)
1See it at AmazonSee it at Barnes and NobleSee it at TargetWhile dominating the Kindle charts, the Empyrean series also holds a strong position in Amazon's top-selling physical books for 2025. Both the deluxe and standard editions of Onyx Storm are within the top 10, with Fourth Wing securing a spot in the top 25. The recent release of Suzanne Collins' new Hunger Games book has temporarily nudged Onyx Storm to the second spot on the fiction list. However, with an influx of new readers starting with Fourth Wing, the series may reclaim its top position before the year ends.
AnswerSee Results### Fourth Wing and Iron Flame are Part of Kindle Unlimited
#### Kindle Unlimited
35See subscription options.See it at AmazonFor 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 books by logging into their Kindle account, providing an excellent opportunity to start the series before the titles possibly leave the subscription service.
