All cultures have a creation story. Some have scripture about omnipotent beings creating everything from scratch. Others have tales explaining how things came to be. In the land and lands surrounding Equestria, there are three prominent stories: one for dragons, one for griffons, and one for ponies. All three stories tell of a mythical creature being sealed into the icy earth far in the north. One is rising again. Princess Celestia sends Twilight Sparkle and friends to protect Equestria from the impending doom if the being is allowed to escape once more.