We know the Celestials had relations with Yuuzhan Vong so obviously they were past the Galaxy, and Abeloth is a celestial
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They still don't have anything that can build and destroy whole galaxies. Is she really a celestial though? I thought that they were more powerful than that
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I've never seen them build multiple galaxies
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I think it was in one of the terminals where they taked about the things like that, that the forerunners could do