Princess Luna

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trigger warnings: none.

☆   Princess Luna is Princess Celestia's younger sister who once served as co-ruler of Equestria and used her magic to raise the moon and safeguard her subjects' dreams during nighttime. A thousand years ago, Luna became bitter about everypony playing during the day while they slept through the night and ignored her. Her bitterness turned her into Nightmare Moon and she attempted to create eternal night all over Equestria before being banished to the moon. 

Many, many years later when she escapes from the moon and attempts to carry out her plan. Twilight and her friends use the Elements of Harmony to defeat Nightmare Moon and turn her back into Luna, who reconciles with her sister and resumes her royal duties. During season nine, Luna and Celestia prepare to retire from ruling Equestria so that Twilight can take their place. At the end of the show, after Twilight was crowned the new ruler of Equestria, Luna and Celestia retired to Silver Shoals.