Thanks. I left that stuff pretty open. Best that way to fit the outcome into the campaign, and to fit the Imp to the party.
There's an interesting side-plot there, what if it promises wealth and then discovers it can't break out? A trip to see a practitioner of the dark arts, maybe? Perhaps one of the old cult leaders still lives, or is unliving? Go to Comment
I'm not sure that I completely understand the item's power, but otherwise good. See Dragon Lord's comments.
Also, try a more interesting name. The name of the item is the first thing that really grabs the reader's interest.