I would like to see secret missions or in other words find a dead body, a lone Fallen soldier who has information, or a ship that crashes and a survivor comes out and has a map of where he was going before he dies at your feed. I'm sure this is in the game and if not it will come in the 10 years it has, but just expressing some thoughts.
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Yeah, I'd like to see missions that you just have to find... Maybe there'd be dialog clues or something, like NPCs talking about some lost technology in some vague area of a forest.