Rebecca Yarros is working on the fourth "Empyrean" novel. Casey Paul/MLB Photos via Getty Images Rebecca Yarros announced that she is writing book four of the "Empyrean" series. The "Fourth Wing" author published the latest book in the series, "Onyx Storm," in January 2025. The author has offered hints about how Violet Sorrengail's story will continue. Spoilers ahead. Rebecca Yarros' next "Fourth Wing" novel is on the way. It's been over a year since Yarros released "Onyx Storm," the third ins