i think that there is at least 1 container in the final room, possibly 2.
pfe solves the hold person spam and tbh your biggest offensive action with pretty much any character is using healing wands on the undead, the quest also drops a higher level of healing wand than most others of that range so it is good for swopping out the lights >moderates>serious.
i have completed this with a level 4 rogue so i know it is possible!