You can pull at least 2 of the magisters with Teleport and deal with them by themselves. That leaves 4 (I think?) to fight. If you spread your party I've had good luck pulling the 2 (ranger/knight combo to the left of Cork) towards most of my party. I've left a guy behind Cork to help heal/fortify or whatever. There's even been times when Cork and the Ranger square off and Trippel has joined the rest of his forces fighting me. Like Damon said, Peace of Mind or just high wits scores in particular should allow you to get upper hand in this fight. Idk your builds or spells but I'm certain any group can pull this fight off with enough experience/practice. If you're still having trouble I'd be happy to run a co-op game with you up to this fight.
