OXM - If you've ever spent an unproductive half-hour banging on about how awesome Assassin's Creed would be, given the ability to invade another player's campaign world, you probably won't be all that chuffed to hear that such a feature once existed.
@Jreca Below
"but I've asked myself some times why there isn't a co-op."
Because theres much more needed features for AC then co-op
We can't even crouch for goodness sake