Twilight's fate is about to take a turn for the strange. A magical ritual has begun in the land of Equestria, and it's not in any of Twilight's books. It's no spell a pony ever cast. It's dangerous. It's destructive. And there's no getting out of it once it's begun. It's called the Holy Grail War, and it's about to engulf the entire town of Ponyville.