(at least for the 10 classes that have difficulty with that part).
A level 10 assassin can get through unscathed, but what other class are you thinking of?
(I'm frustrated by this new dungeon. I've come within a hair of slaying the matron four times now when only to run out of options at the last moment. I've taken her down to below half health as the berserker, bloodmage, rogue, and monk. I guess I'll try assassin next [edit: only got her to half health with that approach...])