On the Doom of Chelchis scout rifle, the description shows Chelchis asking, "Where is the Great Machine?" The Rise of Iron raid is named "The Wrath of the Machine". As Chelchis is described as a Kell, he is one of the Fallen meaning that he may be connected to the Rise of Iron content since the Rise of Iron revolves around Fallen enemies. Sneaky Bungie...
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He was talking about the traveler. Those were his last words after the traveler fled
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Chelchis was calling for the traveler as it abandoned them when oryx took on house of stone.
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Chelchis died very long ago, he was the Kell of House Stone. The members of this house never even knew humans or guardians. They were all killer in the cataclysmic event known as "the great whirlwind".
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Except the Fallen call the Traveler "the great machine."
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The great machine is the traveler. As it abandoned them to move to us, has nothing to do with roi.