It’s a story where Celestia wakes up and finds herself in an AU where she is a filly who is the student of Twilight, who in the story was the only Princess. Luna is there too, but she is a gryphon, and I think the “pet” of Celestia? I don’t remember much else about it aside from it was set up to be quite a dark universe, anyone have any ideas on what the title is?

IIRC, Elemental: Power is magic by Aeluna.

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Thanks!