Indeed as stated I'm trying to make a quasit into a glabrezu's chief assassin due to the previous one (a succubus) being killed by the party (which I did not expect). Yes Tnedor (the quasit) is the weakest follower and yes he will largely serve as an amusing distraction but I'd like to see how strong can a properly outfitted quasit get, the party is around lv 7 with some of them contemplating getting a cohort.
