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' initial surge in popularity began with the release of *Fourth Wing* in 2023, largely driven by the viral phenomenon of BookTok. Since then, this captivating romantasy series has grown exponentially, dominating most bestseller charts.
The release of *Onyx Storm* has not only introduced the series to countless new readers but also underscores the viral appeal of Rebecca Yarros' storytelling. Her unique blend of fantasy and romance has captivated a wide audience, making the Empyrean series a must-read. With a *Fourth Wing* TV series now greenlit at Amazon, the series has the potential to surpass even the iconic Harry Potter franchise in popularity, provided it capitalizes on this momentum.
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
While the Empyrean series dominates the Kindle charts, it also holds strong positions 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 recently outrank *Onyx Storm* is the latest release from Suzanne Collins' Hunger Games series. However, with more readers discovering the series through *Fourth Wing*, *Onyx Storm* could reclaim its position as the top fiction book by the end of 2025.
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Fourth Wing and Iron Flame are Part of Kindle Unlimited
Kindle Unlimited
35. See subscription options. 36. See it at Amazon
For those eager to dive into the series, the first two books, *Fourth Wing* and *Iron Flame*, are currently available for free with a Kindle Unlimited subscription. Subscribers can easily access these titles through the Kindle app, providing an excellent opportunity to start the Empyrean series before the books potentially leave the subscription service.
