Luna, Celestia and Discord have kept a well hidden secret from the history books of Equestrian writing. There was a third celestial sister, this princess was the bringer of the elements of harmony and whose body created the Tree of Harmony. How deep does her ties run as the mane 6 begin to piece together the dark mystery's of Equesrtia and how Midnight Sun is linked to them but when the princess returns she does not bring good will with her. She is fueled by rage and hatred towards her sisters and Discord from her mysterious past, destroying the Elements of Harmony and the most powerful magic known to Equestria. Can Twilight and her friends still stop her from plunging Equestria into the dark times of Equestrian history? Or will they be lost in the dark?