It starts when Rarity and Fluttershy awaken from unremembered dreams, recalling only dread and melancholy – then it spreads to all the bearers of the Elements of Harmony. Something ominous looms over their sleeping heads, subtler and yet far more sinister than any enemy they have ever faced, something that both threatens them and offers them a chilling temptation. If they are to stand their ground, they must stand together, for that is all that can hold it back.