So I have a theory on what the Vex actually are. The Vex are actually a "Technological singularity". A digital hive mind. And the Black Garden is actually a realm beyond ours, created by the Singularity. A virtual paradise... So what do you guardians think? I came up with the theory while I was on a bus so it's not very in depth.
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<The Black Garden is not the true home of the Vex, they merely found it and retrofit it for their use.>