It has been over a thousand years since anypony has seen Prince Nightsong, son of Princess Luna. Since his mothers banishment, he has stayed in the mysterious Dream Realm where he looks over and delivers dreams to all the creatures in the world. Most believe him to be a myth, an old ponies tale. Yet, when the Crusader's hear that he knows what a ponies cutie mark will be they know that they have to find him.
This is a TwilightxOc story with other pairing as well.