After investigating a strange magical energy signature, Celestia stumbles across a young alicorn foal, and is too stunned by the discovery to ask more questions.

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Yeah, I'm honestly labeling this under the 'X is a Changeling' thing that seems to be everywhere here. I really don't know what else to say, beyond the fact that one NekroPony's comment on Blyskawica is what resulted in the idea for this particular story.