Who built the Vex?
Just asking.
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A race far in the future was attacked by the Darkness. They lost as we did. They search the universe for a way to beat back the darkness. A record from long before them tell of a weapon that could beat the Darkness. So they travel back in time for the Traveller. The darkness messed up their bodies so they transfer what would be the equivalent of their brain into robots and send them into the past.