The world of the Shamer books by Lene Kaaberbøl. Vaguely medieval tech level, contains various kinds of rare mind-affecting magic. All types of magic are truth-and-morality based in the sense that each type is sort of either pro- or anti-that thing.

A (much) longer description can be found in this world doc: https://docs.google.com/document/d/1vBiohE3BzkAiDv0gRwuW1wA3N2FMSBeHYREE_lKxAVQ/edit?usp=sharing