Having been humbled and humiliated in front of the entire school after the Fall Formal, Sunset Shimmer feels lost and isolated. However, something from beyond the ether senses her fear and regret, and wishes to drag her down with it.
"Fluttershy...you now hold inside of you a seed of darkness. Whether or not that seed sprouts into a guiding salvation, or a harbinger of destruction, is wholly up to you."