I was thinking that maybe we could go off I book a read. It was kind of like mage Hunger Games without the sponsors. The guys (who are basically the Game masters) that run the game give out these objectives for the mages in the tournament to complete, and more often than not, they mages end up killing each other. Whoever is left gets this object of power, but the twist is that the Game Masters never gave out objectives, so the mages went around "thinning" the competition. 
They did this on a really large area of land that had wildlife and village. It was a pretty cool book, shame I can't remember the name of it.