Princess Luna, Mistress of Dreams, Lunar Monarch, Co-ruler of Equestria, was tending to the dreams of the galaxy as a whole.

Where her sister, Princess Celestia, handles the political standing of their home, She has been tending to the galaxy in its slumber.

However, as she was ensuring her galactic charges well being, she was ripped from Equestria into a situation where death is the least of her worries.