Wouldn't it be absolutely awesome if say every Friday on a rotating time (for the different time zones) the city was raided by different enemies so it would be like a huge fire fight and there would be an alert when it was about to begin and you could just join. There could be a special bonus and if someone got through there could be some kind of punishment but I don't no what it could be.
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Yeah, hordes and hordes of enemies, to would get a bonus for taking part and depending on how many enemies you killed a bonus for that, creating a table for the most kills, the highest total loot and so on...