Actually, the other letter in the Conversation from the Universe thingy, the one that was not encrypted, was not from Mercy to Truth. Its from another Prophet called the "Prophet of Supposition," to Truth. Perhaps this is a character who could play a role in HALO 3? Or perhaps hes merely a minor prophet like the one in the book The Flood that was on board a covenant cruiser when Halo was discovered and when the Pillar of Autumn showed up too.
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