It's set in the future where there are portals, time travel, and multidimensional beings. It's not inconceivable to think that people figured out how to do some of these things before the traveller arrived or before the darkness.
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Always thought the traveller was a representation for God.
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I always thought of it as the sphere from sphere and the darkness is just everyone's fears incarnate.
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I get the darkness part, not the sphere tho.