The life of Raven

This is a story about two sisters who ruled monster kind(undertale)one the ruler of the moon and one of the sun. One day a human comes a tries to destroy monster kind. Raven the ruler of the night waits for the human to come to the castle, once it does she goes full Nightmare mode with her friends. She gets revenge but all her friends and family are dead. She was depressed and the she became an AU master and the story goes on.