Oathbreaker Books in Order

Oathbreaker is Susan Vaught's big-scope fantasy series, written as S.R. Vaught with J.B. Redmond. It takes place in Eyrie, a land of two moons, powerful magic, strict codes of honor, and political systems that can look noble right up until they ruin a child's life.

That child is Aron. At the start of Assassin's Apprentice, he is a farm boy who expects a simple future with his family, until the Stone guild claims him during Harvest and takes him away to train as an assassin. The shock of that separation never really leaves the series. Aron is not stepping into adventure because he wants to. He is being pushed into a role he barely understands.

Aron also learns that he has unusual powers, which makes his training even more dangerous. Stormbreaker becomes his hard, demanding master, while Dari challenges and teaches him in equal measure. Off to the side at first, but increasingly important, is Nic, a prince caught in the same wave of violence and political scheming that threatens the whole land.

Nobody gets to stay innocent for long.

The setting matters a lot in these books. Eyrie is built around guilds, dynasts, old loyalties, and rules that blur the line between justice and force. Assassins can be legal. Oaths can save you or trap you. Magic is real, but so are class, power, and the way leaders protect themselves first when trouble starts rolling downhill.

In Assassin's Apprentice, much of the tension comes from travel, initiation, and the question of who Aron will become once he reaches the Stone. A Prince Among Killers opens the story wider. Aron, Stormbreaker, Dari, and Nic have to work together against leaders and plots that could destroy far more than one family or one province.

Even with the fantasy machinery, the emotional core is pretty human. These books care about grief, chosen duty, found family, and the gap between the stories institutions tell about themselves and the harm they can do in practice. Aron wants revenge at times, but he also wants belonging, truth, and some way to live with what has been taken from him.

That gives the series some weight beneath the swordplay and magic.

If you like fantasy that starts with training and travel but grows into larger political danger, Oathbreaker is the Susan Vaught series to pick up. It has guild intrigue, unusual powers, hidden royalty, and a hero who has to learn that strength without judgment can go bad fast.