Nightmare Moon

Nightmare Moon was one of the main villains from My Little Pony: Friendship is Magic. She is currently set to be a member of the Villain League in the fanfiction series.

BackgroundEdit
Nightmare Moon, also known as the Mare in the Moon, is an Alicorn pony first seen with blue armor and magic mist hair, and is the main antagonist of the first two episodes. A thousand years ago she was imprisoned in the moon by Princess Celestia, until finally her prison breaks and she is once again freed, whereupon she uses her strong magic to capture Celestia and prevent the sun from rising, to make Equestria a land of eternal night.

In an attempt to stop Twilight Sparkle and her friends from reaching the Elements of Harmony, the powerful artifacts that Celestia used to defeat her before, Nightmare Moon uses her magic powers to put a series of dangerous threats in their path to hurt, threaten, or lure them off their quest. At the end of "Friendship is Magic part 2" she is revealed as Princess Luna, Princess Celestia's little sister who is very remorseful of her own actions.

Role in the series
It is unknown why nightmare moon became evil in the first place, or even of her backstory at all. All we know is that the Villain League plans to recruit her and Discord into their team in the hopes of obtaining more powerful members.