Hi!
I’m looking for books about mages, wizards and witches in which the magic itself is a central part of the story and not just there so the MC can slam a fireball into the face of his foes.
Maybe the magic has a will of its own or the MC is trying to ‘restore’ it from some kind of ‘disease’ or something else.
Robert Jackson Bennett is great at this. I’d say check out his Foundryside series.