My guess is that they are similar to daleks or other handymen in that they are damaged humans/human consciousness uploaded or built into a protective exoskeleton.
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I honestly hope not, then its just like 2 classes of Human.
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hmm, interesting... and if humans have that kind of technological prowess, shouldn't the other alien races have it as well? Maybe the Vex are some sort of alien Exo-type...
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Now that's an interesting idea. On a similar note i can't wait to discover the vex back story in game, who or what created them , if they didn't "upgrade" themselves so to speak, how time travel works for them, and why they are here.