Onyx Storm

Onyx Storm is the third book in Rebecca Yarros's Empyrean series, continuing the war between Navarre and the venin—corrupted dark wielders who trade their souls for magical power. Violet Sorrengail, a lightning wielder bonded to two dragons (Tairn, a copper wyvern, and Andarna, an irid scorpiontail of the legendary seventh dragon breed), faces an escalating crisis: the protective wards around Navarre are failing, venin attacks are intensifying, and her lover Xaden Riorson is slowly transforming into a venin himself after channeling from the earth to save her life. The book opens with Violet desperately seeking a cure for Xaden's condition while navigating political intrigue, military alliances, and the discovery of her own hidden signet—dream-walking, a dangerous ability to enter others' unconscious minds. As the war reaches Navarre's borders and former enemies become reluctant allies, Violet must lead an expedition to distant isles in search of Andarna's irid family, hoping they possess knowledge to defeat the venin. Instead, she finds only rejection, heartbreak, and the devastating truth: there is no cure for channeling. The book culminates in a catastrophic battle at Draithus where Xaden, forced to choose between his humanity and Violet's life, surrenders to darkness itself, transforming beyond recognition while Violet achieves her greatest victory—killing the Maven Theophanie—only to discover Xaden has vanished, leaving her with a marriage blessing and no memory of how it was obtained.

Following the discovery that Xaden Riorson has channeled from the earth—a capital offense that would result in his execution—Violet Sorrengail works desperately to find a cure while keeping his condition secret. She enlists Imogen's help and learns from the imprisoned Jack Barlowe that channeling creates an irreversible trade: power in exchange for pieces of one's soul, with no cure available. Despite this grim news, Violet refuses to abandon Xaden. When a venin breaches Basgiath's defenses and is killed during an attack on the infirmary, Violet recognizes among the attackers a silver-haired dark wielder named Theophanie, who mysteriously vanishes after making eye contact. Xaden reveals he has become more venin than human, able to sense other dark wielders and perceive power sources the way they do.

Political tensions escalate when Violet's attempts to secure the safety of Aretian fliers through official channels fail. She orchestrates an unauthorized modification of the wardstone with her brother Brennan's help, using runes designed by Trissa and Kylynn that allow fliers to wield magic without compromising the wards. When Colonel Aetos arrests her for treason, the king reveals pre-signed pardons that protect everyone involved. However, General Aetos retaliates by threatening Violet's entire squad, making them leverage against her obedience. He orders them to dangerous duty at Samara, and when they learn of an impending attack on the nearby village of Newhall, the squad votes to attempt a rescue mission despite the risks.

During the rescue at Newhall, Theophanie appears and creates a devastating tornado that throws both Tairn and Garrick's dragon down a mountainside. Violet discovers that Garrick possesses a secret signet—the ability to walk distance—and that Theophanie demands to know which of Violet's dragons bonded with her first. After Tairn carries Violet back to Basgiath in an impossibly short time, General Aetos separates Xaden and Garrick from the quadrant by ordering them to the Eastern Wing. During an intimate moment, Xaden loses control of his shadow magic, scorching furniture and leaving marks on Violet that suggest he channeled her power. Terrified of harming her, he imposes physical restrictions on their relationship.

Xaden is appointed professor of Signet Sparring at Basgiath, creating a violation of the Code of Conduct that prohibits relationships between cadets and faculty. When General Aetos denies an exemption, Violet reveals to him that she, not Xaden, killed Vice Commandant Varrish years earlier—a shocking confession that changes nothing regarding the exemption. Violet's father's locked journal is retrieved by Dain, revealing instructions for Violet to travel to Deverelli and find a woman named Narelle Anselm, with warnings about the King of Navarre and instructions to trust only Mira.

Violet assembles a squad and travels to Deverelli, a land where magic does not function and dragons retain their power. Crossing the ocean severs all bonds between riders and dragons except Violet's connection to both Tairn and Andarna—revealing an unprecedented dual bond that marks her as extraordinary. In Deverelli, the group retrieves a citrine artifact from Anca, but Aura accidentally burns Captain Grady alive when she panics at his appearance. During the chaotic evacuation, Aura is killed by a wyvern, and the group barely escapes. Theophanie leaves a taunting note, revealing she knew about the mission and could capture Violet at any time. Later, Violet meets with Narelle Anselm, who guards her father's life work and tests Violet's worthiness through three questions about history, strategy, and self-respect. Narelle grants her six password-protected books, suggesting that Mira has a separate role to play in the larger mission.

When Prince Halden attempts to control the mission's composition, Violet defies him by ripping up her orders and demanding to choose her own squad. Halden grants her one chance and she selects Xaden, Mira, Ridoc, Drake Cordella, Dain Aetos, Prince Halden, and Halden's guard. Tecarus arranges for Halden to travel by ship to Deverelli while the others fly, but as they approach the island, Violet and the other riders lose magical communication with their dragons. Only Violet retains her connections, deepening the mystery of her dual bond.

At King Courtlyn's palace, negotiations become violent when Halden accuses the king of theft and attempts to assert sole authority to speak for Navarre. Courtlyn orders Halden's execution, but Violet negotiates from a position of strength by having Andarna capture Courtlyn's prized panther, Shira. She secures an alliance and presents Courtlyn with Andarna's dragon egg shell—the only shell of its kind—as a gift. In exchange, Halden is banned from Deverelli on pain of death. Violet seals the alliance with the king of the seventh dragon breed confirmed.

Returning to Basgiath with weeks lost, Violet discovers that Xaden's eyes still show amber flecks, indicating his progression toward venin has not reversed. The wards continue to fail, with Mira calculating they will collapse in approximately six months. A second-year cadet manifests venin characteristics and is executed by Professor Carr without hesitation, crystallizing the reality of their danger. Violet proposes ignoring orders and searching the isles continuously until finding Andarna's family.

The expedition launches in early March, flying to Unnbriel where they encounter Queen Marlis after a brutal combat test at a temple of Dunne. Marlis reveals she is the only warrior who defeated Violet in combat, and demands twelve dragon eggs—two of each breed—as payment for military alliance. Violet refuses, explaining dragons choose their own riders. Flying to Hedotis, they meet Xaden's mother Talia, who abandoned him as a child and built a new family in Poromiel. During a dinner orchestrated by the triumvirate, Violet unknowingly poisons four leaders with arinmint tea, then discovers they poisoned the dessert with zakia berries. She identifies fig as the antidote, saves Garrick's life, and blackmails Faris into alliance by revealing she knows about his crimes and that Garrick is the Duke of Tyrrendor through his mother Talia.