One of the many alternate futures Twilight found herself in during her long quest to thwart Starlight Glimmer was a realm ruled by Nightmare Moon. Having come across the dark alicorn herself, Twilight now journeys with her, under threat, travelling deep into the Everfree Forest to show her the means to travel through time.
During that journey, the fallen princess has more than a few words of wisdom to bestow upon the young mare beside her.