Carpedium

I can't get into that building but she gave me the key. Is this a bug?

I'm looking for the lost shade Moref. I asked the mage in Solberg's tower about it and she told me that it was in some warrens to the east. I went to the east barrier and found the suspicious tower and a cave to the north of i a bit. When I entered the cave I found three bodies and no shade. Where exactly are the warrens?