Nightmare Moon is one of the villains in My Little Pony: Friendship is Magic, and the main antagonist of the two-part pilot episode "Friendship is Magic" also known as "Mare in the Moon". Before that, she was known as Princess Luna, and is the younger sister of Princess Celestia
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MLP:FIM The Pegasisters guide book
Alteleevery pegasister needs to know this, so why not have it all in one place?
