you don't have MG obviously,
first thing first, pair sword for str mg is a must, mg defense is the lowest or one of the lowest so shield won't do.
second, mg is not the highest damage dealer, not second highest, not even third
third, good pentagram build is a must, preferably Blinding, but it's not easy since it's very random, that's why Slayer is a better alternative
peace🙂