So, through various means, you've signed up for a fighting tournament. The prize? A mystical artifact capable of granting wishes, at the cost of one's soul. The rules? It's a fight to the death, or until one of the fighters forfeits. I'll add more in the OP of the sheets, but is anyone interested in just this? I won't let this one die. Seriously. Just trust me this time.
You have lots of good ideas that depend so heavily on their execution (like this one) That said, it sounds nice.