OK here\'s my idea. PvP, as in duelling, could be done anywhere, but both people would agree to the duel. You wouldn\'t lose anything, and you could maybe make a bet on who will win. As for pking, there would be a \"battlefield\". What would add a tactical element to travelling through the game would be if this warzone was in the middle of the map, but there were ways around it. So it could be between the two major cities, and if you wanted to travel there you could either take the risk, walk round or pay a fee to travel thorugh safely, like get a bus or buy a temporary invincibility amulet to pass through. There could be arenas in the cities for people wanting to vent their anger, or for guild wars or large battles, as well as the battlefield.
I know this isn\'t strictly related, but while I\'m talking about arenas, what about a gladiator kind of thing where you pay a fee to fight against some really tough monsters in the arena and if you win you get a prize? Or how about tournaments between players?
Edit: Spelling