The older a universe and its ouroboros, the thicker its hide: Jörmungandr's is nigh impenetrable, but younger universes are more accessible.
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Experienced world walkers can, by the patterns of its scales and symmetries of its physics, tell whether it's a cousin of ours, a sibling,
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But the easiest way to get into another universe is still to start it, because that's where the hole in the ourotorus lies