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Contacts give out another series of missions story arcs. These are linked missions that form a much larger tale. Players normally receive story arcs only after theyve leveled their Contact up to the highest level. Whenever a named character occurs, hell be a Lt. for the solo player at the lowest Reputation level and a Boss for teams or solo players with higher Reputations. Arch Villains, Elite Bosses and Giant Monsters will remain as they are; but, for the early and mid-levels, players will not need to defeat these foes to complete the mission. In the high levels, this is not the case.
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Currently contacts give out the story arcs pretty early on in the mission sequences that they give you. I'm concerned that at the default level of difficulty, it takes quite a while indeed to get to the maximum alliance level with contacts, and that I think you may well out level the standard 5 contacts before this cold happen. in fact, doing the Story Arcs is a great way to raise you reputation with a contact, much more so that doing mission after mission.
I'm in the 30-35 range, and I work through each contact until I get ths story arc anc then play through that story arc. So I've pretty much only done the story arcs, and now I am 33, having completed them all. Not all my contacts are maximised yet.