Features:
Find out what arena you want to join. Then simply type /combat join <arena>. As soon as a second player joins, the first round will be ready to start. There will be two minutes for anyone else that wants to play to join. After that, you'll be spawned in the arena. Run around until you get your items. Every time you kill someone, you'll get two extra arrows. Be the last one standing to win the round. Win the most rounds to win the game.
/combat create - combat.create /combat join - combat.join /combat leave - combat.leave /combat spectate - combat.spectate
The wand id is 2262. First, get yourself that music disc (by typing /i 2262, typing /give <player> 2262, or looking in your creative inventory for music disc number 7). Next, select your two points by right and left clicking. After you've come up with the arena name, type /combat create <name>. You can create as many of these as you want in as many worlds as you want!
Planned features: