Seriously, why? There should be a way to get the new Exotic Armour another way on the other 2 Characters besides doing the full campaign.
How about a separate quest once completed and then an emblem for completing them..
Just a dragging repetitive storyline. No fun!
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Having to do it 3 times will be rough. That said, apparently you can get to 200 power pretty easy if you have another character that high already.