Everyone looked at him to see him changing Fluttershy’s mane color and style, from having a spiky silver mane that curved off to the left side, to then having black spiked hair that stuck out in all directions that also defied gravity, to finally possessing long silver hair that flowed down to the end of her flank as he also changed her coat to be completely white with her one of her wings turned black.

Did did he just turn fluttershy into pony sepheroth?

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Indeed