All combined. Say when you type challenge player, it offers an actual challenge that they can decline or accept, perhaps an accept 5 which would give 5 min of prepartion. Both players are transported to the arena where they fight to the death, or multiple players. Now an idea for how people can actually safely view the fight would be such as a limited snoop ability for only those that are in arena. Say Virisin and I are fighting, they can see the fight through my eyes destroying Virisin, not seeing the commands and such I type, but the actual output of typing them, only the combat ones as to decrease spam for them. I'm sure it'd be possible to do something like that, not sure how difficult though. If the system could keep track of how many times they've challenged, been challenged, challenges to them accepted or rejected, challenges won and lost. Of course you could also only challenge those close to your level.