I have a couple of questions:

1. There is a locked stone chest in north section that I can't seem to find a key for.

2. The four doors and only one key, when I picked up the key I got a message saying something to the effect that it's to bad I can make duplicates. Then I found a strange mirror. These two things make me think of the mirror in Divine Divinity that could duplicate an item. Can I duplicate the key?