Vex could erase all of those from existence by traveling back in time and preventing them from ever existing
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Then why didn't they do that with the guardians
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Because they can't comprehend the purpose of the hive. If they killed all the guardians, they would not be capable of defending themselves against Oryx. Oryx can also only be destroyed by the light in his throne world. The Vex do not have access to either. The Vex are the most powerful alien race. Capable of seeing billions upon billions of years into the past and future. Atheon is also only one of the weakest vex gods.
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And the vex can be taken so there also the flood that can take them
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But the vex can manipulate time and prevent the flood from ever existing.
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Prometheans are older then the vex
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Yes, I understand that, but the vex can go back to before they existed to eliminate any threats to their own existence
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Then Promethians could do the same.Vex can only do that in the vault.
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No. They can travel through time outside the vault as well
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Just read all of the Grimoire for the Vex.They can only do this in the vault.