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Unknown at the time. It's been speculated by fans that it's going to be one of 3 factions: The Flood, Forerunner, or the Precursors, though there is no evidence for or against any of these speculations. However, it's also been stated that the "Legendary Planet" is not of human, covenant, nor forerunner origin. Best answer: We don't know, and only time will what the "Ancient Evil" is.

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