Wouldn't it be cool if the enemies(fallen, vex, etc.) had clans within themselves. The same way guardians have the New Monarchy and Dead Orbit, there were other clans specific to the other races. The fallen may have 3 cults, each specific to a certain region in a ship similar to our tower. We could reckon up into their "tower" and have missions to sabotage their clan missions. Rather than the typical always spray and play we experience, why don't we have spy type missions where we enter their "tower" and take out only one captain then make our way out. A sniper mission so called. Just an idea I wish they could implement...