Flurry is a great Alicorn. She’s cute and she seems to be pretty powerful even as a little toddler and filly.
Once, when she visits the dream world in her sleep, she runs into two very familiar ponies as she was waiting for her dream companion back in the human world. And given by her Characteristics, she knew she’s getting herself into nothing but trouble.
More specifically, being the focus of a fight between the evil royal sisters.
But, aren't Nightmare Moon and Daybreaker and Celestia and Luna the same person?
Flurry sounds like a 40 year old.
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They are the dreamy versions of Tia and Luna.
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In the real world, they inhabit the same bodies, but they are different spirits, hence why they are different beings in the dream world.