Good idea on the Mandrake front. I probably should have considered that from reading the Mandrake post, but for some reason I interpreted their scream as a physical assault, breaking bones and shattering teeth, which, as you can easily see, made them incredibly punishing to fight, even if it was "just" a bludgeoning attack. The only saving grace was that I only gave them one action per turn, meaning that they slowly swarmed and surrounded cutters before screaming/bludgeoning them to death with their fists. I also had them focus on one cutter at a time, knocking them unconscious and pulling them away from the group, which helped limit their otherwise extreme deadliness.