The Iron Flame explained a shocking twist regarding Xaden that has huge implications for the upcoming third book, Onyx Storm. The first book in the Empyrean Series, Fourth Wing, saw Violet Sorrengail be thrown into the Riders Quadrant of Basgiath War College, forced to undergo the grueling and deadly challenge of becoming a dragon rider rather than the safer and more mundane role of a scribe as she’d trained. She meets and falls in love with the man she thought was her enemy, Xaden Riorson.