Until Eris broke free from her stone prison the previous spring. Celestia had expected her to do as before, spreading chaos throughout Equestria. Instead, Eris showed unusual restraint by challenging Celestia's student and her friends to a high-stakes game. And the prize? The artifacts known as the Elements of Harmony, Weapons, Neil idly noted, that had initially petrified her. In the end, her student won, and Eris was once more a statue.