I think he's stuck in the chamber where you have to get the ring for the girl from the grave (Im bad with remembering names)

But I can't remember skeletons down there or not very strong ones atleast.

I think if you have trouble killing them you might need to do some more side quests and level up some more or use different skills...

At the moment I can't be more of help sorry.

Don't play when you have a mushroom phobia! o.O xD