I'm by no means an expert since I just got the game the other day, but you'll just have to come up with a strategy to kill those skeletons to retrieve your pyramid, and then you can use them from safe locations. My warrior didn't have any problems but he has good life & that spinning attack that hits everyone around him. You'll probably have to run like Carl Lewis and cast spells as you can.
Alternately, you can just go in on level 1 to kill some of the easier critters that don't mob you and try to gain a level or two before you retrieve the pyramid. There are a few quests in town that can net you a couple of levels as well. I believe if you just go through the catacombs you will eventually come upon the pyramid anyways, although it's handy to get first so you don't have to truck through parts of the map you have already cleared.
Persistance should win you the day.