What do you think it will be? Most people assume some type of enemy, but I'm sure someone has a different idea. POST IT
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Maybe, just maybe, it's a forerunner rip-off and all the aliens worship them and seek to destroy the Humans in their name. jk jk. I think it will be the sort of "hidden enemy" we won't see until the middle of the game and we are all like "woah now, that's why the Traveler helped us". I really can't imagine them being good guys