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Character analysis

Rhiannon Matthias

in Onyx Storm by Rebecca Yarros

Rhiannon Matthias is one of Violet Sorrengail's closest friends and most loyal allies at Basgiath War College, providing emotional support amid the growing turmoil of Onyx Storm. A rider marked by fierce loyalty and practical bravery, Rhiannon acts as Violet's confidante and moral guide within their squad, always putting the safety and unity of her loved ones ahead of her own ambitions.

As the conflict with the venin escalates and Violet's secrets multiply—especially concerning Xaden's transformation and the wider dangers facing the continent—Rhiannon often has to navigate without complete information, yet her dedication to those she trusts never falters. In this installment, her character evolves from a supportive best friend into someone who asserts her independence: she takes on more tactical responsibilities, faces tough realities about the leadership she once admired, and wrestles with the grief from past losses, including the haunting memory of Liam Mairi's death.

Her key traits include intense protectiveness, emotional insight, and a firm sense of justice. She readily calls out hypocrisy—whether from instructors, command, or allies—and her straightforwardness contrasts with Violet's more conflicted viewpoint. Rhiannon's relationship with her dragon and her squad mates emphasizes the series' core message that chosen family is the true foundation of survival. By the end of the novel, she emerges as one of the rebellion's most dependable pillars.

About this character

Form
Novel
Author
Rebecca Yarros
First published
2025

The person01–03

01·Who they are

Who is Rhiannon Matthias?

Rhiannon Matthias is a dragon rider at Basgiath War College and the emotional backbone of Violet Sorrengail's inner circle throughout Onyx Storm. While Violet grapples with singular power and proliferating secrets, Rhiannon serves as the squad's moral north star—grounded, perceptive, and steadfast in her convictions. She is neither naïve nor reckless; her bravery is thoughtful and stabilizing, sustaining collectives under pressure. Fierce protectiveness, emotional intelligence, and a strong aversion to institutional hypocrisy define her actions. Her straightforwardness acts as a narrative counterweight to Violet's more fractured, guilt-ridden perspective, providing readers with a clearer view of loyalty devoid of self-deception in wartime.

02·Arc & motivation

What is Rhiannon Matthias's arc and motivation?

Rhiannon enters Onyx Storm already shaped by loss—most notably Liam Mairi's death, a wound that remains open throughout the novel. This grief is not passive; it drives her to treat every surviving squad member as irreplaceable and to respond with hostility toward any command decision that instrumentalizes riders. Her arc in this installment evolves from the role of supportive best friend to one of genuine tactical and leadership responsibilities, asserting herself in areas historically dominated by riders with more seniority or political capital. Her motivation stems not from ambition but from a conviction that the people she loves deserve someone who will stand firm, unyielding, and unafraid when lives are at stake.

03·Key moments

What are Rhiannon Matthias's key moments?

Rhiannon's most revealing scenes occur in the gaps—the moments between crises when she chooses to stay close to Violet, knowing she is not privy to all the information. Her willingness to operate on incomplete information and extend trust deliberately signifies a maturation from the early-series dynamic where the squad often acted as a unit with shared intelligence. Her confrontations with command decisions echoing the institutional failures surrounding Liam's death highlight her recognition of the patterns of expendability she was once too junior to name. Her navigation of Xaden's growing venin corruption is particularly telling: rather than retreating into denial or outright hostility, she maintains a dual awareness— scrutinizing him as a potential danger to Violet while recognizing his necessity for the larger struggle—a balance that demonstrates her hard-earned emotional complexity. Her evaluation of Cat Cordella's shifting loyalties further shows that Rhiannon's loyalty is earned through demonstrated behavior; she is a patient and thorough evaluator.

The cast04–05

04·Relationships

What are Rhiannon Matthias's most important relationships?

Violet Sorrengail is central to Rhiannon's social world, yet their relationship transcends simple protection. Rhiannon grounds Violet rather than shelters her; she is one of the few people Violet leans on rather than conceals the truth from, making their bond distinct from Violet's connections with nearly everyone else.

Liam Mairi remains a powerful presence throughout Onyx Storm in his absence, shaping Rhiannon's behavior. His death informs her protectiveness of the squad and her sharp distrust of leadership structures that view riders merely as tactical assets.

Xaden Riorson earns Rhiannon's tentative, hard-won respect because she does not offer it easily. She prioritizes Violet's interests, requiring Xaden to continually prove himself—this dynamic positions her as one of the more honest reflections of his character in the novel.

Imogen Cardulo and Rhiannon share a practical alliance founded on mutual recognition of competence rather than warmth; their differing primary loyalties—squad versus rebellion—create productive tension, united by a commitment to protect Violet.

Dain Aetos elicits lingering skepticism from Rhiannon, who remembers enough of his past institutional compliance to hold it against him while still being open to reconciliation.

05·Connected characters

How is Rhiannon Matthias connected to the other characters?

Violet Sorrengail

Rhiannon is Violet's best friend and most trusted confidante. She provides emotional grounding when Violet is overwhelmed by secrets, power, and grief, and is one of the few people Violet genuinely leans on rather than protects from the truth.

Xaden Riorson

Rhiannon's relationship with Xaden is defined by cautious, hard-won trust. She is protective of Violet and therefore scrutinizes Xaden's choices, particularly as his venin corruption deepens, but she ultimately respects his role in the fight against the greater threat.

Liam Mairi

Liam's death continues to cast a long shadow over Rhiannon in Onyx Storm. Her grief for him informs her fierce protectiveness of surviving squad members and her distrust of any command decision that treats riders as expendable.

Imogen Cardulo

Rhiannon and Imogen share a tense but functional alliance built on mutual respect for competence. Their interactions highlight differing loyalties—squad versus rebellion—but they find common ground in protecting Violet.

Dain Aetos

Rhiannon holds lingering skepticism toward Dain, whose past decisions endangered Violet and the squad. She does not easily forgive institutional loyalty that came at personal cost to those she loves.

Aaric Graycastle

Rhiannon interacts with Aaric as a fellow squad member navigating a dangerous hidden identity. She is pragmatic about his presence, judging him on demonstrated loyalty rather than his royal lineage.

Garrick Tavis

Rhiannon views Garrick as part of the extended circle of riders she must assess and trust by necessity. Their relationship is collegial and shaped by shared stakes in the war effort.

Bodhi Durran

Bodhi and Rhiannon occupy parallel roles as loyal seconds within their respective circles. Their interactions are marked by mutual recognition of duty and the emotional cost of supporting leaders carrying impossible burdens.

Cat Cordella

Rhiannon is wary of Cat given her complicated history with Violet and Xaden. She watches Cat's shifting allegiances carefully, unwilling to extend full trust without clear proof of genuine loyalty.

Brennan Sorrengail

Rhiannon respects Brennan as Violet's brother and a powerful ally, but her loyalty is to Violet first, meaning she evaluates Brennan's choices through the lens of how they affect her best friend.

Study06–07

06·Questions

Questions readers ask about Rhiannon Matthias

Who is Rhiannon Matthias's best friend in Onyx Storm?

Rhiannon's best friend is Violet Sorrengail, and their bond is one of the novel's most central relationships. Unlike most people in Violet's life, Rhiannon is someone Violet genuinely leans on rather than shields from the truth. Rhiannon functions as Violet's emotional anchor—grounding her when secrets, grief, and power threaten to overwhelm her, making their friendship a rare space of honest, mutual reliance.

Why does Rhiannon Matthias distrust Dain Aetos in Onyx Storm?

Rhiannon distrusts Dain because of his history of institutional compliance that endangered Violet and the squad. She remembers enough of his past choices—prioritizing command loyalty over the people he was supposed to protect—to hold them against him. While she remains open to the possibility of reconciliation, she does not forgive easily, especially when past decisions came at a personal cost to those she loves.

How does Liam Mairi's death affect Rhiannon Matthias in Onyx Storm?

Liam's death remains an open wound that actively shapes Rhiannon's behavior throughout Onyx Storm. His loss drives her to treat every surviving squad member as irreplaceable and fuels a sharp distrust of any command decision that treats riders as expendable tactical assets. Rather than grieving passively, she transforms that loss into a structural critique of military institutions—making her one of the novel's most insightful voices on how leadership discards individuals.

How does Rhiannon Matthias handle Xaden Riorson's venin corruption?

Rhiannon responds to Xaden's deepening venin corruption with hard-earned emotional complexity rather than denial or outright hostility. She simultaneously scrutinizes him as a potential danger to Violet and acknowledges his necessity in the broader fight against the venin threat. This dual awareness—protective wariness alongside pragmatic respect—reflects how far she has matured from the earlier dynamic in the series, and positions her as one of the more honest mirrors of Xaden's character.

Does Rhiannon Matthias have any famous quotes in Onyx Storm?

No direct quotes from Rhiannon are recorded in the available material for Onyx Storm. Her impact on the novel is conveyed less through memorable lines and more through her actions: staying close to Violet amid incomplete information, confronting command hypocrisy, and offering loyalty that is deliberate rather than blind. Her voice is best understood through what she does rather than what she says.

What role does Rhiannon Matthias take on by the end of Onyx Storm?

By the novel's end, Rhiannon has evolved from a supportive best friend into one of the rebellion's most dependable pillars. She assumes greater tactical and leadership responsibilities, stepping into spaces historically occupied by riders with more seniority or political capital. This shift is driven not by personal ambition but by her conviction that the people she loves need someone who will stand firm and unyielding when lives are at stake.

How does Rhiannon Matthias evaluate Cat Cordella's loyalties in Onyx Storm?

Rhiannon approaches Cat Cordella with careful wariness, unwilling to extend full trust given Cat's complicated history with both Violet and Xaden. She watches Cat's shifting allegiances closely and judges her on demonstrated behavior rather than stated intentions. This patient, thorough evaluation is consistent with Rhiannon's broader approach to trust—it must be earned through consistent action, not claimed through words or circumstance.

What motivates Rhiannon Matthias to remain loyal to Violet even when kept out of key secrets?

Rhiannon's loyalty to Violet persists despite being excluded from critical information because her commitment is rooted in conviction rather than knowledge. She chooses to extend trust deliberately, operating on incomplete information as a sign of maturation rather than naivety. Her motivation is fundamentally relational: she believes the people she loves deserve someone who will not abandon them when the full picture is withheld, treating uninformed loyalty itself as an act of courage.

07·Essay angles

Use this in your essay

Tool · Essay angles

  • Grief as political consciousness

    Argue that Rhiannon's reaction to Liam's death transforms private mourning into structural critique, positioning her as one of the novel's most insightful commentators on how military institutions discard individuals.

  • Loyalty versus information

    Explore how Rhiannon's decision to remain loyal to Violet despite being excluded from key secrets complicates the series' exploration of trust—is uninformed loyalty a virtue or a liability?

  • The indispensable secondary character

    Analyze how Rhiannon serves as a narrative device that uncovers truths about Violet, Xaden, and institutional power that the primary perspective cannot access or express.

  • Chosen family and survival

    Use Rhiannon's relationships to examine *Onyx Storm*'s main argument that chosen family is the foundational unit of resistance, probing where this framework thrives and where it falters under the novel's pressures.

  • Female friendship as counter-narrative

    Consider how the Violet–Rhiannon dynamic challenges typical fantasy tropes of female rivalry and competition, and what ethical or political significance this resistance holds within the genre.

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