Fourth Wing Books Top Amazon's Kindle Best Sellers in 2025

The Empyrean series has skyrocketed to the top of Amazon's Kindle best sellers list for 2025, thanks to the latest release, *Onyx Storm*. The series' meteoric rise began with the 2023 publication of *Fourth Wing*, which quickly gained traction on Booktok. This romantasy series blends fantasy and romance in a way that captivates a wide range of readers, propelling it to dominate bestseller charts across the board.

The release of *Onyx Storm* has not only brought in new readers but also highlighted the viral appeal of Rebecca Yarros' storytelling. With Amazon greenlighting a TV series based on *Fourth Wing*, the Empyrean series is poised to potentially outshine even the iconic Harry Potter franchise, given the right strategy and execution.

The Physical Editions Are Popular Too

The series isn't just dominating digital sales; it's also a powerhouse in physical book sales. Both the deluxe limited edition and standard edition of *Onyx Storm* are in Amazon's top 10 best-selling physical books for 2025, with *Fourth Wing* holding strong in the top 25. The only book to edge out *Onyx Storm* for the top spot in fiction is the new release from Suzanne Collins' Hunger Games series. However, with an increasing number of readers diving into the series starting with *Fourth Wing*, *Onyx Storm* might reclaim its position before the year's end.

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Fourth Wing and Iron Flame are Part of Kindle Unlimited

For those eager to jump into the series, *Fourth Wing* and *Iron Flame* are currently available for free through Kindle Unlimited. Subscribers can access these titles by logging into their Kindle account and downloading them before they are potentially removed from the service. This offers a fantastic opportunity for new readers to explore the world of the Empyrean series without additional cost.