The Empyrean series has taken the literary world by storm, 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' ascent to fame began with the 2023 release of Fourth Wing, which gained immense popularity through Booktok. Since then, Rebecca Yarros' romantasy series has captivated readers, securing its place at the pinnacle of best seller charts.
The release of Onyx Storm has not only attracted new readers but also highlights the viral appeal of Yarros' storytelling. Her unique blend of fantasy and romance has a broad appeal, drawing in a diverse readership. With the announcement of a Fourth Wing TV series in development at Amazon, the Empyrean series is poised to eclipse even the Harry Potter franchise in popularity, provided it capitalizes on this momentum.
The Physical Editions Are Popular Too
Onyx Storm (Deluxe Limited Edition)
1See it at AmazonSee it at Barnes and NobleSee it at Target
While dominating the Kindle charts, the Empyrean series also features prominently 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 securing a spot in the top 25. The only book to momentarily overshadow Onyx Storm is the new release from Suzanne Collins' Hunger Games series. However, with an influx of new readers drawn to Fourth Wing, the rankings could shift again by the end of 2025.
AnswerSee ResultsFourth Wing and Iron Flame are Part of Kindle Unlimited
Kindle Unlimited
35See subscription options.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 on the Kindle app through a Kindle Unlimited subscription. Subscribers can easily access and download these titles before they potentially leave the Kindle Unlimited catalog.
