The Brothers Magnus Books in Order

This series is set in an alternate late medieval Europe, with one crucial difference: some people can Speak to saints for supernatural help. The Church is not comfortable with that arrangement, and many people call the same forces devils instead. That tension gives the books their bite. Magic is useful, feared, political, and never far from accusations of heresy.

At the center are the Magnus brothers, especially Anton and Wulfgang. Anton is the soldier and rising noble. Wulf is the younger brother with the dangerous gift of Speaking. Their family is tangled in debt, war, and obligation from the start, and Duncan uses that family pressure to keep the story grounded even as the stakes widen toward fortresses, invasions, and statecraft.

These are very much books about brothers.

That matters because the series is less interested in a lone hero than in how loyalty frays under stress. Jealousy, pride, love, and duty all pull the Magnus family in different directions. Wulf's power can help save a country, but it also changes how other people use him, fear him, or try to control him. Anton cannot simply be brave and solve everything with cavalry charges when the real battlefield includes religion, politics, and suspicion.

The setting gives Duncan room to play with gunpowder-era change, border conflicts, and court maneuvering, while the magic keeps the world slightly off-center. The tone is more historical than high fantasy, and the pleasures come from intrigue, family tension, and the way miracles can make an already unstable world even less reliable.

If you like fantasy that feels close to history, but with one smart magical alteration changing the entire political weather, this series is a strong fit.