Duels would be a very interesting thing to add to destiny. 1v1 custom games with options to limit weapon use, abilities, ammo, ect. Sword duels, sniper duels, walk 10 paces and shoot. Warlock sumo using solar wind. Only other thing they'd need to add is spectator mode so others can watch. Or they could even put it in the tower. Personally I'd like to see room put in the tower that allows you to spectate matches. Just something to make destiny more immersive.