Robots from the future. Doesn't create paradoxes when we encounter them.
Obviously they never interacted with our humanity to begin with and were created outside of Sol.
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It does however create a paradox if they get destroy by us at 1:30am and a different group from 7pm travels back in time to help that group, and saves it. Because once the group is saved they have no reason to have traveled back, et cetera
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They may be time traveling robots, but that doesn't mean that they can time jump at will. I theorize that they do single gigantic time jumps, and all the Vex jump into the proximity of a great power source to fuel their newly built robots and ultimately their next time jump, never jumping to the same spacetime twice to prevent themselves from paradoxing out of existence. In my idea, mini-jumps are a waste of energy, or the Vex are simply incapable of doing so, because every single Vex jumps when a time jump is initiated.
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I respect your opinion and will not argue it.
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I respect your opinion on my opinion and will like it. There's no point in arguing over yet to be revealed lore, I'm just theorizing.