Hooks r weak vs. mind spells.. Always liked to turn them one on another.. The masses are a bit annoying, but after the 1st time u'll know how to set your party.. I suggest to freeze the game asap after they show up and drive your entire party toword a far end (if it has some hooks - nuke'em with weak magic and your melee fighter/s) and defend your casters by pushing them to the wall and covering them with fighters and high dodging chars..
I talk too much c'ya