The idea is awesome, I love the idea and think it will be very fun. Its almost like the movie battle royale, its a very unique, I believe that it will possible attract more players to the game. but osrs does need more mini games, I remember with fist of Guthix came out it was all the rave, and a very fun mini-game as well. But yeah, I'm game!
You should make a reward system that allows winners to recolor armor and wep**s! Winners could choose to have Guthix or Sara rune armor instead of just plain rune. Or Gilded to the champion. This could just be able to show case the champion in the next game.
Not a bad Idea, but im kinda missing the reward of getting my skills up (for more damage), like in Soul wars.
Soul Wars
prototype for OldschoolRunescape