You paint a interesting picture but not sure how this would work from a game point of view.
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Standard horde mode, Waves of enemies, stronger and larger groups as the process continues. With "friendlies" doing minimal damage from the wall. Supposedly the Fallen are regularly attempting to wipe us out, otherwise they are just milling about on earth, this activity type would give us an opportunity to do just that, defend the city against a fallen attack. We get to be a real Hero to the city, Do something that will fell at the end like we accomplished something ya know?