Art of the Adept is the sequence that brings Michael G. Manning to this page, and Disciple of War is the instalment our shelves have picked up. The names alone set the register: magic learned as a discipline, and a story that travels from study towards conflict.
This is long-form fantasy in the traditional mould, running past twenty-one hours, which is the length at which a series stops being a story and becomes a place you go back to. Listeners who like their magic given rules, and their protagonists made to earn every advance, are the natural audience.
The catalogue files it with teen and young adult listening, a reasonable shelf for fantasy of this kind, though the running time suggests it will suit adult listeners just as comfortably.