The Moon has two sides; the side we see, and the dark side. It moves through the sky in phases; an endless cycle. Luna is no different; she has a side we don't see and she has her own cycle that cannot be broken.
Or can it?
Can a pony sent to watch Luna- and kill her if the Nightmare returned- break the cycle of the Princess? Can she end the torment that Luna must live through every day? What will it take? What will she do?
[[This was an RP between myself and Corporal Fluttershy that we're slowly converting into a story because its sooooo cooooool!
Credit for Luna, Nightmare Moon, and Bright Light go to Corporal Fluttershy. I claim Moon Trot and most of the NPCs of the story. Celestia is split between us.
Credit to 90sigma for the cover art]]