I'm writing a book where the mc is a practitioner of blood magic, but i'm not sure what the mc's motive for learning it is since its supposedly an illegal art in my world. I do have some rough ideas though, like the mc and his family being struck by poverty and his only hope was the magic exam, but unfortunately he failed. Suddenly, he encounters a tattered caravan with a bunch of corpses and two books, plus some stones. The other one is where the mc has a cultist father or mother and they teach him their ways. I'd still like to hear your guys' ideas, though, since i'm still not sure yet if they're the paths I want to go with since the first idea is rather cliche.