One of a series of four. Twilight was given the announcement that Princess Celestia and Princess Luna are retiring and that the title "Ruler of Equestria" will be passed down to her. With that knowledge she is afraid that she might not be cut out to rule all of Equestria, but the princesses did task her with a challenge to see if she is indeed ready for such a important responsibility. Twilight realizes she won't be able to do this alone. She picks out three of her best fighters to help her and they all head out to an island so dangerous that Celestia and Luna themselves are afraid to go. They call the island, Ragnarok. Only time will tell if the four will succeed on their journey.