Fourth Wing Ending Explained: The Battle, Betrayal, and Brennan's Return

Spoiler Warning: This page reveals every major plot turn from the end of Fourth Wing, including the final chapters and epilogue. Do not read until you have finished the book.

Fourth Wing closes with a cascade of revelations that upend everything Violet Sorrengail knows about Navarre, the war, and the people she trusts. Below is a literal account of what happens, why it matters, and the major questions the ending leaves open.

The Climax: The Outpost Attack and the Venin Reveal

The war-games mission that sends Fourth Wing to Athebyne is a trap. Violet realizes that Dain read her memories without her consent and passed every detail to his father, Colonel Aetos. In retaliation for the secret missions Xaden has been running beyond the wards, the colonel orders Xaden’s wing to an outpost where the wards have already failed — with instructions essentially to “survive if you can.” The moment the squad arrives, wyvern and venin descend.

The battle is the first time Violet faces a venin. She is stabbed by a poisoned dagger, her arm breaks, and black blood spreads through her veins. With Andarna’s help, Violet freezes time long enough to channel lightning from both Tairn and Andarna, striking the lead venin and killing him. Because a venin’s death annihilates all wyvern it has created, over half the horde falls from the sky. Xaden kills the final venin. Severely burned-out, poisoned, and bleeding, Violet slides unconscious from Tairn’s back and falls.

Andarna again stops time, catching Violet and transferring her to Xaden’s arms. Xaden ignores every rule and flies Violet not to Basgiath but over the Cliffs of Dralor to a hidden destination — the rebuilt city of Aretia. He begs an unseen ally to save her, and finally confesses he loves her.

This battle sequence weds the book’s central reveals: the existence of venin, the truth about the wards, and the rebellion’s secret stronghold.

Major Character Outcomes

Violet Sorrengail: Survives the venin wound thanks to her brother Brennan’s mending in Aretia. She learns the truth about the revolution and agrees to join, but tells Xaden she cannot trust him with her heart. By the final page she is awake and facing the choice to stay and fight.
Xaden Riorson: Drops the last of his secrecy. He admits he has been smuggling weapons to the gryphon fliers, that Aretia was never razed, and that the marked ones have been using Melgren’s signet limitation to hide. He vows to earn back Violet’s trust “every single day,” but his omissions have cost him her immediate forgiveness.
Dain Aetos: His retrocognition signet—constantly brushing Violet’s face—gives him access to her memories of Xaden’s secret missions. He tells his father, unwittingly sentencing the whole wing to a deadly trap. Violet confronts him with the accusation “You’re supposed to be my best friend.” His betrayal is not yet fully addressed; he is flown out of the battle but his standing with Violet is shattered.
Liam Mairi: Killed by Jack Barlowe during the earlier tower fight. Violet uses her lightning to kill Jack in retaliation, but Liam’s death is the personal tragedy that hardens her. Xaden later gives Violet a wooden carving Liam had made of Andarna, confirming the loss.
Jack Barlowe: Violet blasts him off a tower with a lightning strike that triggers an avalanche. “I know he can’t survive.” No body is recovered, but the narrative treats him as dead.
Tairn: Pledges to keep Violet alive, even as she burns herself out. He carries her through the time-stopping moments and delivers her to Aretia. His bond with Violet deepens, and he fully accepts her as his rider.
Andarna: Reveals she is a feathertail—a rare, young dragon capable of stopping time. Her gift is what saves Liam’s body from falling and helps Violet destroy the venin leader. The secret of her youth and power remains a dragonkind secret that Violet is not allowed to share.
Brennan Sorrengail: Violet’s brother, long presumed dead in the rebellion, appears at the end of chapter 39 as the mender who saved her. He opens his arms and says, “Welcome to the revolution, Violet.” He has been rebuilding Aretia and fighting the venin in the six years since his supposed death.

Resolved Threads

The venin are real. The kingdom has suppressed all knowledge of the venin and the failing wards. Violet witnesses them, kills one, and now knows the real enemy.
The rebellion is not crushed. Aretia still stands; the marked ones have been coordinating beyond Navarre’s sight. Melgren cannot see outcomes when more than three marked ones assemble, so they exploit that blind spot.
Dain’s behaviour is explained. His overly protective, controlling touch was retrocognition feeding Colonel Aetos. The war‑games trap is a direct result.
Violet’s signet is lightning. She wields it fully, learns to channel from both dragons, and uses it to slaughter dozens of wyvern. Xaden calls her “the weapon,” and her power is now impossible to hide.
Jack is (apparently) dead. Violet’s revenge for Liam closes the first‑year antagonist arc.

Unresolved Threads

Violet and Xaden’s relationship. She loves him but cannot trust him. He vows to earn her back. The book leaves them in emotional limbo.
Dain’s consequences. He betrayed Violet’s trust but remains alive and part of the wing. The fallout has barely begun.
The venin invasion. Only a handful of venin were killed; the larger threat looms beyond the wards. The war is now openly on two fronts.
Navarre leadership. General Sorrengail and the scribes are complicit in the cover‑up. Violet must decide what to do with that knowledge.
Brennan’s full story. How he survived and what he has built in Aretia is only hinted at.
Andarna’s fate. As a feathertail, her powers are growing, but the risks of using them are immense. She is central to the next phase.

Theme Resolution

The ending crystallises every major theme introduced early in the book.

Survival and brutality: Violet’s journey from fragile cadet to lethal rider concludes with her killing the enemy who murdered her friend. The quadrant’s mantra that strength alone matters is turned sideways: Violet survives because of her cleverness, her bond with her dragons, and the trust of the squad she built.
Forbidden love and sacrifice: Xaden’s choice to fly Violet to Aretia sacrifices his secrecy, his mission, and possibly his life. Violet’s decision to stay and join the revolution, even while wounded by Xaden’s lies, shows that love is now tangled with the cause.
Power and signet manifestation: Violet’s lightning is not just a destructive force but the means to protect. Xaden’s shadow wielding saves them repeatedly. The time‑stopping power Andarna gifts Violet is a literal reclamation of stolen seconds. The ending argues that power must be claimed, not suppressed.
Truth and suppression of history: The book’s entire political structure collapses when Violet learns that the scribes have erased venin from history and that the rebellion was always fighting the real enemy. Brennan’s library in Aretia symbolises knowledge unbanned.
Trust and betrayal: Dain’s violation of Violet’s mind is the ultimate breach. Xaden’s half‑truths, while meant to protect her, hurt almost as deeply. By contrast, the squad (Rhiannon, Ridoc, Sawyer) remains loyal. Violet ends the book trusting her dragons completely and cautiously deciding to trust the revolution.

The Epilogue: Aretia and Brennan

There is no separate epilogue; chapter 39 acts as the epilogue. Violet wakes in a room overlooking the Temple of Amari and immediately recognises the city from her father’s drawings: Aretia. The city was never burned—the scribes lied. Xaden admits that he is the heir of Aretia and that the marked ones have been slowly rebuilding it. Brennan walks in, alive and well, and welcomes Violet to the revolution. The final line, “Welcome to the revolution, Violet,” reframes the entire series: Navarre is not the victim; it is an oppressor that hides the venin threat. Violet is now on the side of those who fight it.

Six Reader Questions Answered

Did Jack Barlowe really die?
Violet hits him with a lightning bolt that collapses a tower and an avalanche of rock. She explicitly states she knows he can’t survive, and Baide, his dragon, cries as if mourning. No body is seen, but the books treats him as dead.
How exactly did Dain betray Violet?
Every time Dain touched Violet’s face, he used his retrocognition signet to read her recent memories. He saw her memories of Xaden’s secret meetings and trips beyond the wards and then reported them to his father, Colonel Aetos. That intelligence led directly to the war-games trap meant to kill nearly sixty riders.
What are venin and why are they secret?
Venin are red‑eyed humanoids who drain magic and energy from the land and living things, and they create wyvern as mounts. Navarre’s scribes have erased all records of them because acknowledging them would expose that the wards are failing. The kingdom prefers to let border villages die than admit the truth.
Is Andarna really a baby dragon?
Yes, she is a feathertail—an adolescent dragon that has not yet developed full offensive capabilities. Her colour, size, and time‑stopping ability mark her as young and extremely rare. Tairn forbids Violet from revealing this because doing so would risk the hatchling’s safety.
What does Brennan’s return mean for Violet and the rebellion?
Brennan is a mender and has been leading the revolution from Aretia for six years. His survival means Violet now has a direct family tie to the rebellion. It also proves that the Sorrengail siblings are all positioned to reshape the conflict: Mira enforcing the wards, Violet as a weapon, and Brennan as a healer and leader.
Will Violet forgive Xaden fully?
The book ends with Xaden promising to earn back her trust, and Violet saying she can’t trust him with her heart yet. She does love him, but his lies—especially hiding the rebellion and the truth about the venin—have wounded her deeply. The door is open for reconciliation, but it isn’t assured.