A power struggle between two royal sisters of a magical land of Equestria, and a master of nightmares from Tartarus, fight over the life of a rare breed of human that died out in Equestria long before the ponies became the sentient beings of the world. Their struggle has now lead to a battle through the dark ones realm of twisted nightmares that will test the love and wits between the two sisters and the human. As they impersonate to plushies of night and day to give him hope and the light he needs to battle the darkness

(Inspired by Among The Sleep)