It started with the sudden appearance of a strange mare from a land beyond Equestria's borders, of a race that nopony has ever laid eyes on except for royalty. She came with a warning that the balance between good and evil was shifting, without any idea of what threat would lay siege to hard-won peace. All the Elements of Harmony can do is stay vigilant and watch with this mystical visitor haunting their every step, wary of not only the dawning shadows, but the very source of the news. With no way to tell who is friend and who is foe, the stress of keeping watch may well tear the girls apart long before the faceless threat to Equestria's peace shows itself.