Oathbound

by Tracy Deonn

Book 3 of the The Legendborn Cycle series

Oathbound by Tracy Deonn pushes The Legendborn Cycle into its most dangerous phase, where oaths, loyalty, and legacy collide in a fight for truth and power.

Oathbound by Tracy Deonn is the third installment in The Legendborn Cycle, intensifying the series’ exploration of power, identity, and resistance as ancient oaths tighten their grip on a world already fractured by truth. Where Legendborn revealed hidden magic and Bloodmarked exposed institutional corruption, Oathbound confronts the consequences of binding oneself to systems built on exclusion and control.

Bree Matthews enters this chapter more isolated than ever. Marked by power she neither asked for nor fully understands, she must navigate a world where allegiance is enforced through blood, ritual, and inherited obligation. Oaths - once symbols of honour and protection - are revealed as tools of domination, designed to preserve power by limiting choice. Bree’s struggle becomes one of autonomy: how to claim identity when history itself seeks to define it.

At its core, Oathbound is about loyalty under coercion. Deonn interrogates what it means to be bound - to a cause, a lineage, or a promise made without consent. Characters are forced to confront the difference between duty freely chosen and obedience demanded. This tension drives the novel’s emotional and political stakes, reinforcing the series’ focus on morally grey institutions.

The Legendborn Order faces growing instability as secrets unravel and authority fractures. Secret societies splinter under pressure, revealing competing ideologies and desperation to maintain relevance. Power adapts rather than disappears, reshaping itself to survive rebellion. Deonn presents resistance not as a singular movement, but as a series of difficult, often conflicting choices.

Romantic and interpersonal relationships are tested to their limits. Trust erodes as characters are pulled in opposing directions, aligning strongly with love vs duty, slow burn romance, and enemies to lovers tropes. Emotional bonds deepen conflict rather than resolving it, underscoring the cost of vulnerability in a world governed by secrecy and obligation.

Themes of grief, inheritance, and self-determination continue to shape Bree’s arc. Healing remains nonlinear, complicated by anger and unresolved loss. Deonn refuses easy resolutions, instead portraying growth as an ongoing act of resistance against narratives imposed by history and power.

Action and magic escalate throughout the novel, but always with consequence. Every oath carries a price, every victory a cost. The mythic weight of Arthurian legend presses against contemporary reality, reinforcing the series’ central question: who gets to decide what the past demands of the present?

Oathbound is ideal for readers who enjoy Fantasy that blends mythological retelling with emotional depth and political complexity. Urgent, powerful, and unflinching, the novel solidifies The Legendborn Cycle as a defining contemporary fantasy series about reclaiming legacy - and breaking the bonds that were never meant to be worn.

Publication Details: