it's all very loosey-goosey. he's a cursebreaker by day, necromancer by later day (underground circles know he does it but it's not common knowledge). i have a primer on his dumb rich family if that interests you but the gist of it is - they maintain their prestige and wealth by having a necromancer every generation that gets secrets from the dead of the other olde~ wizarding families? and then they play politics behind the scenes like a puppet master of the dead.
he doesn't care much for THAT part of it all, but he actually loves the intellect & study behind the necromancy even if it will inevitably lead him to an early grave lol. so i would love another necromancer buddy, is what i'm getting at here.