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Eventually, after a long time, people forget what the constellations are called. Heck, they forget that the constellations ever existed. They look up at night, and they don't see Cassiopeia or the Pleiades, they just see stars.
And then one day, a random summoner sees Dipper's birthmark and remembers it. The next night, the summoner looks up and sees the symbol they saw on Alcor the Dreambender in the sky.
And wouldn't that be something? Knowing that the Dreambender was powerful enough to shape the stars in his image?
That summoner tells it to a few close friends over a few drinks.
They don't believe them, of course, until the summoner gets them to go out and look at the sky.
And then those few close friends tell a few close friends of their own, and those friends tell their friends, and it goes on until everyone knows that the Dreambender is powerful enough to shape the stars.