Derpy's father says there's a monster in the basement. He says she must never go down there or it will gobble her up. She decides to investigate anyway.
When Sunset sees herself as an alicorn in a magical mirror, she goes looking for answers, eventually going through the mirror into another world. Some things are better left alone though, as she finds herself trapped in the other world as a child.
Ever since Rarity knew she was a filly, she knew what it meant to be a lady. Her prince would sweep her off her hooves any moment now, if only she were a little more lady-like. That's what she tells Twilight, anyhow.
When a different world's Ember arrives wielding the instinct-manipulating Bloodstone Crown, only the Dragon Lord stands between Equestria and the deadly call of the wild.
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No humans. In Equestria's past, ponies exist only to serve their creators. One such pony is accidentally released from her mental chains, but how can one mare save herself and her people if she doesn't even know she's a slave?