I gotta pretty good idea. You start a match with some guild mate on a stage, where other guild mates can watch it. Only melee, fists if they come out, sword, daggers, bayonets, only exception I'd have is like blunderbuss or pistol for ranged. Must have same exact weapon, like both have Rusty Cutlass or something so one cannot use weaponry to overpower the other person. I think it'd be cool if on the stage you could parry and block enemy attacks. This could be a guild pvp thing, yet not the only choice for pvp with guild mates.