I have a theory that the Traveler is Evil to backup my theory, The Darkness follows the Traveler where ever it goes, also I think the Traveler is a Beacon for the Darkness.
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Yes, in the original story, the traveler and speaker were meant to be evil. They changed the story when the creative team quit 3 months before release though. If you want more info on it, go watch the video that Game Theory made on it.