Onyx Storm (The Empyrean, #3) by Rebecca Yarros

Rebecca is a #1 New York Times, USA Today, Sunday Times, and Wall Street Journal bestselling author of over fifteen novels, including FOURTH WING, and is always ready to bring on the emotions. She's also the recipient of the Colorado Romance Writer’s Award of Excellence in New Adult for Eyes Turned Skyward from her Flight and Glory series. She loves military heroes and has been blissfully married to hers for twenty-one years. She’s the mother of six children and lives in Colorado with her family, their stubborn English bulldog, feisty chinchillas, and Maine Coon cat who rules them all. Having fostered then adopted their youngest daughter, Rebecca is passionate about helping children in the foster system through her nonprofit, One October.