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Qurias, the Vex mind that challenged sword logic, stole a Hive worm and learn of their benefits. This, in turn, led to the Black Heart.
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Yes, that's who he was. But what was his last action.
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Was stealing the Hive worm not it?
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No, his last action was sending the data of all he had on Oryx to the axis minds. After that he was imprisoned.