I was really drawn in by the backstory and although, as some say, the soul stealing sword has been done before, the history and twists on the sword's properties make for an interesting variation. Well done... Go to Comment
I left the item details pretty vague so that GM's can fill in the details themselves. In the context that I was thinking in when I made it up I wasn't even thinking of the munchkin aspects. The type of use I envisioned was the item being used against the players by a powerful vampire. Can run can't hide type deal. Or perhaps that it was being used by a good character who was trying to fight the vampy urges and find a cure. The character would then half to deal with the curse and possession affects.
Thanks again for the comments. It's been years since I played so I'm sure I'll need help in the "making good ideas good for games" department.
I'll probably change things so that high level clerics can detect beings who use the cloak to become invisible and do things to negate the effects. Also the cloak could also degenerate after being on the prime material plane for a certain length of time. Go to Comment