Little moments in Rebecca Yarros' bestselling fantasy novel "Onyx Storm" could have huge implications for the rest of her "Empyrean" series.

Rebecca Yarros’s ‘Onyx Storm is the fastest-selling adult novel in the past 20 years. The book, the third in a series, has sold 2.7 million copies in its first week and is topping every bestseller list.

A spoiler-filled review of Onyx Storm, breaking down Violet's rise as a leader, Xaden's fate, and the gasp-worthy moments that took place.

Bestselling author Rebecca Yarros ' newest addition to The Empyrean series hit the shelves on Jan. 21, and less than two weeks later, the New York Times reported a stunning 2.7 million copies of Onyx Storm sold in its first week. This makes the third book in the series the fastest-selling adult novel in two decades, the outlet reported.

"Onyx Storm" author Rebecca Yarros breaks down the ending of her latest book, plans for Book 4 release and the "Fourth Wing" TV series.

Rebecca Yarros' latest book, "Onyx Storm", has officially arrived. The author shared a message for fans on the release day of the highly anticipated novel, the third installment in Yarros' popular Empyrean series.

The book, the third in a series, has sold 2.7 million copies in its first week, and provided yet another example of the romantasy genre’s staying power.