oh, so that was where the discussion was headed, my bad on topic: similar to mint's theory, but instead of Celestia possessing artifacts similar to Nightmare Moon's, i would say that after having to control both day and night for a complete millennia she "absorbed" traits of both, changing her original pink-only mane to a more complete color spectrum also worth copypasta of what an anon said on that discussion linked so maybe we are just trying too hard