Twilight drinks a potion, creating herself a monster at night, and the insentient Twilight every pony knew. She kills all her friends by night, but when the sun rises she wakes up with that pony dead. She has no clue who would do that and how she managed to get there at the time of death. She turns herself in after she finds out it was all her, she seeks the help of her faithful teacher. Will Celestia be able to save Twilight before it becomes her turn to be killed?