Jealous of her sister’s pupil, Vice-Principal Luna seeks out Rainbow Dash to make into her own personal student under her instruction. As her teachings go on, Luna uses more of the dark magic that comes from the moonlit night of her lessons, giving Rainbow Dash more characteristics of her bat-like servants from her Equestrian self. Finding herself with these batpony instincts, Rainbow Dash in her loyalty to her teacher becomes the creature of the night that Luna wants her to be.

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