I've been going through the cards and can't find any hints as to what is inside the traveler. Was it a ship of a really advanced race like the forerunners from halo? Or does it store the best specimens from the races it has tried to protect so far? Any other theories someone might have???
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A button that is labelled "Do not press. Will end reality.". It possesses a memetic effect that tempts anyone that sees it to push it. The Traveler was made around this button to keep it safe from the Order of the Sacred Button Pushers (Or The Darkness for short).