Why don't the Vex kill everyone considering they have an endless army?
English
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Its not their "true" goal.. We don't know what the vex are really doing / what they really want.
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some thank its because they cant go to places that where never touch by the travelers light, so they cant come back to our time.and since they always had to handle the light from the traveler or those that wield it, they never won a foothold
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We obviously have some connection to the Vex, or else they would wipe us out