Well the cabal and the vex are at war, maybe some clues there?[spoiler]the cabal built the vex then the vex went rouge[/spoiler]
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There is no way the Cabal would have made the Vex. Even if it was within their intelligence it just isn't their style.
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It was just a thought. [spoiler]At least I'm smart enough to think about it[/spoiler]
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Considering the intelligence of many people on the internet, yeah.