The *Iron golem* can't get through the doorway, the others can. If you're looking for tactics, I'd have someone wake up 2 of the golems at a time and run out of the room. Lead them into a doorway where your tanks are set up to pound them one at a time(in the doorway) until they're dust. Then go back and wake some more of them up and do the same.
If you have a Cleric, there' an even easier way to do it, but I don't want to spoil you unless you ask for it. So, do you want the spoiler?
