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

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' popularity took off with the launch of Fourth Wing in 2023, largely fueled by the viral power of Booktok. Since then, this captivating romantasy series has grown immensely, consistently topping bestseller charts.

The surge in readership following Onyx Storm's release highlights the viral appeal of Rebecca Yarros' storytelling, which masterfully blends fantasy and romance to captivate a diverse audience. With the announcement of a Fourth Wing TV series in the works at Amazon, the Empyrean series has the potential to eclipse even the Harry Potter franchise in popularity if it continues to play its cards right.

The Physical Editions Are Popular Too

Onyx Storm (Deluxe Limited Edition)

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While dominating the Kindle charts, the Empyrean series also holds strong positions on Amazon's top-selling physical books list for 2025. Both the deluxe and standard editions of Onyx Storm are in the top 10, with Fourth Wing maintaining a spot in the top 25. The recent release of Suzanne Collins' new Hunger Games book has temporarily pushed Onyx Storm to the second spot on the fiction list, but with more readers discovering the series through Fourth Wing, we might see it reclaim the top position by the end of 2025.

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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 with a Kindle Unlimited subscription. Subscribers can easily access these titles by logging into their Kindle account, making it a perfect opportunity to catch up before the books are no longer included in the subscription.