The idea would be that occasionally, say a few times a week, a giant army of darkness tries to invade the city, and the game notifies you with a message when your in orbit or at the tower, and gives you the option to help. The battlefield would be on the outskirts of the city, and it would support something like 64 or more guardians, and they would have to fight off droves of enemy troops, elites and boss monsters. I think that would be super fun.
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Aw... that would be sick. Would never happen but I seriously wish it would.