Obtaining a Justice and retribution kit is, I believe, a good way to go about it. Any person who stands in your way should be dealt with accordingly, and the retribution kit from the Guild can do all the job for you.
I think black magic isn’t good in my opinion now there’s retribution that’s different. I believe that if a sorcerer / magician uses it to harm then there will be a karma backlash. I also think it disempowers you , I’m not saying you shouldn’t work with demonic entities just do it safely use The Grimore of the Faust