Ok, turns out it's Mardek's amulet, but it doesn't seem to have any abilities at all.
I still havn't figured out why I lost Int. I did fight the 2 vampires, and it wasn't the shrine of good/evil because I know I got 5 Agi for that one.
I do have a new question after playing all weekend. What is the purple potion? Can you do something with it if you have alchemy? I got to the wasteland, and saw that there are red and yellow potions also. What are they for?