In the extended theory I think I mention something about the traveler being the core of the ninth world.
I'd have to say they may be similar, traveler-like beings that naturally became the core of their planets.
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How is the traveler the core of the ninth world when it came from a different galaxy? Remember the traveler helped the moons that orbited fundament
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The traveler is a candidate. the darkness has a core too. (some kind of worm? Maybe a dark traveler?) whoever seals the ninth world to their side gets to use their core to forge the ninth world.