"No one believed that she was needed until she was needed."
Celestia has ruled for over a millennium without help. She has bought peace, protected her kingdom, and successfully handled both day and night without problems. When the fabled "Princess of the Night" returns there is less than applause. No pony sees her purpose, others gossip about her, and some see her as still a villain. No pony treasures her worth. But when a dream eating force threatens Equestria causing all types of psychological pain and suffering, Celestia and the Elements of Harmony are helpless to stop it. Except for one.