I think a match made hoard mode with a larger lobby than six that replays the Battle of Twilight Gap would be fun. Defending against waves and waves of fallen or any other enemy type with fellow guardians would be a super great time. It'll need some building on but I think this could become a thing in destiny. Pls give me feedback on this
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You could add some story behind it like it was just another day and you were flying back to the tower on your ship when you got shot down by a Fallen Skiff. Now your stuck outside the wall to defend a surprise invasion. DUN DUN DUN