Who built the Vex?
Just asking.
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I would guess since they're time traveling robots. Probably a future ticked off faction considering you get vex armor from that faction, with them having an alternate motive for creating the vex. Or a species yet discussed bent as every other race on our anilation. When looking at a description of the vex they're prone to attack any and everything. [spoiler]It was probably Didact who made them lol ;-)[/spoiler]