| Name | Dain Aetos |
|---|---|
| Age | 21 (Fourth Wing), 22 (Iron Flame), 22–23 (Onyx Storm) |
| Species | Human |
| Status | Alive |
| Quadrant | Riders Quadrant, Basgiath War College |
| Rank/Title | Former Squad Leader (Second Squad, Flame Section, Second Wing → Fourth Wing); later Wingleader, Fourth Wing |
| Signet | Retrocognition |
| Eye Color | Brown |
| Hair Color | Brown |
| Dragon Bond | Cath (Red Swordtail) |
| Family | General Aetos (father); mother (unnamed) |
| Love Interests | Violet Sorrengail (childhood best friend; former crush); Amber Mavis (implied); Sloane Mairi (love interest) |
| Appears in | Fourth Wing (2023), Iron Flame (2023), Onyx Storm (2025) |
Biography
Early Life
Dain Aetos was born in 612 AU, the son of Colonel Aetos. He grew up alongside Violet Sorrengail because of their parents’ military positions, and the two became close childhood friends. Violet knew him for most of her life, and their bond was built through years of shared outposts, childhood games, swimming, climbing trees, and secret codes.
Before Basgiath changed him, Dain was one of the people Violet trusted most. He knew her weaknesses, her humor, her intelligence, and the physical limitations she had spent her life working around. That history makes his later overprotectiveness more complicated: Dain genuinely cares about Violet, but he often sees her through the lens of the fragile girl he grew up trying to protect.
Fourth Wing
Dain enters the Riders Quadrant one year before Violet. By the events of Fourth Wing, he is a second-year rider and Squad Leader of Second Squad, Flame Section. His position marks him as capable and respected, but it also puts him in a difficult role when Violet unexpectedly enters the Riders Quadrant instead of the Scribe Quadrant.
At first, Dain tries to protect Violet by keeping her close. He places her in his squad, checks on her, and repeatedly urges her to transfer to the Scribes because he believes she will not survive as a rider. His intentions are protective, but his actions quickly become suffocating. Instead of trusting Violet’s strength and choices, he keeps trying to decide what is safest for her.
Their friendship begins to break apart as Violet grows into her place among the riders. Dain’s strict loyalty to the Codex and his refusal to believe in Violet’s ability to survive create a widening distance between them. The divide becomes worse after Violet bonds Tairn and Andarna, tying her to Xaden Riorson through Tairn and Sgaeyl’s mating bond.
Dain’s worst mistake comes when he uses his signet on Violet without her consent and passes what he learns to his father. Though he does not understand the full consequences at the time, that information helps Colonel Aetos send Xaden’s squad into danger during the War Games, leading to the deaths of Liam Mairi and Soleil Telery. For Violet, this is the moment Dain’s protection becomes betrayal.
Iron Flame
In Iron Flame, Dain becomes Wingleader of Fourth Wing, but his authority is complicated by the distrust surrounding him. Violet wants nothing to do with him, and many of the riders around her no longer see him as someone she can rely on. Dain still believes in order, rules, and the Codex, but the events of Fourth Wing have already begun to expose the limits of that worldview.
One of Dain’s most important moments comes during Violet’s interrogation assessment. When Varrish orders him to use his signet on Violet, Dain refuses. It does not erase what he has done, but it shows that he is no longer blindly willing to violate her mind just because someone in authority tells him to.
After Violet is tortured by Varrish, Dain is forced to confront the truth more directly. Violet shows him memories that reveal the reality of venin, the lies surrounding Resson, and the consequences of his father’s actions. Dain finally understands that his trust in his father and the military system has been misplaced. His decision to turn against Varrish and leave with Violet, Xaden, and the others marks his break from Navarre’s official version of the truth.
In Aretia, Dain works with Violet and Jesinia to translate Warrick’s journals. His knowledge of Krovlish becomes important when he helps correct a mistranslation, changing their understanding of the wardstone text. During this time, he also admits that he trusted his father when he should have trusted Violet’s judgment. Violet does not fully forgive him, but Dain accepts her boundaries and continues to help the Revolution.
Dain later helps imbue the wardstone in Aretia, and Cath serves as the Red Den representative when the dragons breathe fire into the ward chamber. By the end of Iron Flame, Dain has shifted from rule-bound Basgiath loyalist to someone actively helping the Revolution, even if his past mistakes still define how others see him.
Onyx Storm
By Onyx Storm, Dain is fully aligned with the Revolution. He joins the quest squad that travels through the island kingdoms and becomes valuable because of his language skills, especially when ancient texts and translations become central to the group’s mission.
His role in Onyx Storm also continues his personal arc. Dain is no longer trying to control Violet or force her into the life he thinks she should have. Instead, he works beside the others, accepts the consequences of his past choices, and begins building trust through action rather than words.
His connection with Sloane Mairi becomes especially important. Dain still carries guilt over Liam’s death, but his relationship with Sloane gives him a chance to act differently. When Sloane uses her siphoning signet to channel energy from Dain into Brennan to save Mira, Dain supports her and affirms that she is not a weapon. This moment shows how much he has changed from the rule-bound rider who once failed to truly see Violet.
Physical Description
Dain is described as tall, broad, and muscular, with the trained build of a rider. By the time Violet sees him again in Fourth Wing, he has changed noticeably from the boy she grew up with. He has strong, calloused hands, tanned skin, and a scar along his chin that is partly hidden by his beard.
He has light-brown curls, usually kept close-cropped, and sandy-brown eyes. Violet notes that he has grown from cute into someone striking, with a polished, capable appearance that fits his role as a squad leader.
Dain usually wears the black uniform of a rider. His leathers include dagger sheaths, and he carries multiple blades. His dragon relic, a red dragon from Cath, is located on his shoulder and is usually covered by his clothing.
Personality
Dain is defined by order, loyalty, and control. At Basgiath, he clings to the Codex and believes rules are what keep people alive. This makes him disciplined and dependable in some situations, but it also makes him rigid. He often struggles when the right thing to do does not fit neatly inside the rules he has been taught to follow.
His protectiveness toward Violet is one of his strongest traits, but also one of his biggest flaws. Dain loves Violet as his oldest friend and cannot bear the idea of losing her. Because of that fear, he repeatedly tries to make choices for her instead of trusting her to make them herself. He sees danger clearly, but he often underestimates Violet’s strength.
In Fourth Wing, this makes Dain frustrating and controlling. He wants Violet safe, but his version of safety requires her to become smaller than she is. He pushes her toward the Scribes, doubts her place in the Riders Quadrant, and fails to understand that protecting someone does not mean taking away their agency.
Over time, Dain begins to change. His refusal to use his signet on Violet during Varrish’s interrogation assessment shows the first major crack in his blind obedience. After learning the truth about Resson, venin, and his father’s role in the cover-up, Dain starts choosing people over rules and truth over authority.
Dain’s arc is not a simple redemption story where one good act erases everything. Violet does not immediately forgive him, and the damage he caused remains real. But his later choices show a man trying to become better: less controlling, less certain that the system is right, and more willing to earn trust instead of demanding it.
Powers
Lesser Magic
Through his bond with Cath, Dain can perform lesser magic. This includes locking and unlocking doors without touching them, moving with preternatural speed, manipulating mage lights, powering ink pens, and placing runes.
Imbuing
Dain is capable of imbuing, a rare ability that allows a rider to leave power in stasis within an object. This skill comes naturally to only a handful of riders, making it an important part of his contribution to the wardstone work in Aretia.
Signet: Retrocognition
Dain’s signet is retrocognition, the ability to read and feel another person’s memories through touch. He can search memories by focusing on specific words, allowing him to narrow what he is looking for instead of experiencing everything at once.
Because his signet requires physical contact, the military does not treat him the same way it treats inntinnsics. Still, his power is extremely invasive and valuable for intelligence work. This is why Dain’s nonconsensual use of his signet on Violet becomes one of the most important betrayals in their relationship.
Dain can channel significant power through Cath, though early in the series he admits that he is not yet fully skilled at controlling everything he can access. Under Varrish, his signet becomes a tool of interrogation and control, forcing Dain to confront the moral cost of the power he wields.
Abilities
Languages
Dain has a strong gift for languages, which becomes especially useful once he joins the Revolution. His knowledge allows him to assist Violet and Jesinia with ancient texts and translation work, particularly during the effort to understand Warrick’s journals.
Relationships
| Violet Sorrengail | Dain grew up alongside Violet, and for years their bond was marked by trust and familiarity. Violet once had feelings for him, and their friendship carried the possibility of something romantic. However, Dain’s overprotectiveness, refusal to trust her choices, and eventual misuse of his signet destroy much of that trust. In Iron Flame and Onyx Storm, he begins to repair some of the damage, but their relationship never becomes romantic. |
|---|---|
| Aaric Graycastle | Dain, Aaric, and Violet grew up around one another because of their parents’ military and political ties. Later, as Wingleader, Dain assigns Aaric to Fourth Wing and helps keep his true identity hidden, protecting him from the attention that would come with being known as Cam Tauri. |
| Xaden Riorson | Dain’s relationship with Xaden is tense from the start. At first, Dain sees Xaden as a threat to Violet because of Xaden’s connection to the rebellion and Violet’s mother’s role in the execution of the rebellion leaders. Later, his dislike becomes more personal as Violet grows closer to Xaden and pulls away from him. After Dain turns against Varrish and joins the Revolution, Xaden allows him to live, recognizing that Dain’s intentions have changed. |
| Commanding General Aetos | General Aetos is Dain’s father. Their relationship appears distant but influential, especially because Dain trusts him and the military structure he represents. In Iron Flame, Dain begins to understand the damage caused by his father’s lies. After Violet shows him the memory of Resson, Dain rejects his father’s version of events and joins the Revolution. |
| Burton Varrish | Varrish acts as a mentor figure to Dain in Iron Flame, particularly in relation to his signet. However, his methods are cruel and manipulative, using interrogation and control under the guise of training. Dain eventually rejects Varrish’s authority after seeing what he has done to Violet and helps bring him down. |
| Amber Mavis | During his first year, Dain grew close to Amber Mavis, then a second-year. Their connection is strongly implied to have been more than friendship. When Amber later leads a group of unbonded cadets in an attempt on Violet’s life, Dain refuses to believe her guilt and pressures Violet to retract her accusation, deepening the rift between them. |
| Sloane Mairi | Dain’s relationship with Sloane is shaped by guilt over the death of her brother, Liam, for which he feels responsible. Over time, their dynamic shifts toward trust and mutual respect. In Onyx Storm, a turning point comes when Sloane channels energy from Dain into Brennan to save Mira’s life. Dain openly affirms her worth, telling her she is “life,” not merely a weapon, signaling the development of a deeper bond between them. |
Dragon
Cath
Dain is bonded to Cath, a red Swordtail dragon. Through Cath, Dain can channel lesser magic and manifest his signet of retrocognition. Cath’s relic appears as a red dragon on Dain’s shoulder, usually hidden beneath his uniform.
Cath is also important during the raising of the Aretia wards. He serves as the Red Den representative when the dragons breathe fire into the ward chamber, making Dain and Cath part of one of the most important magical moments in Iron Flame.
