What if one of Equestria's greatest hopes vanished? What if Equestria's strongest ally was the one to destroy the place she once called home? A new foe has appeared, and this time, not even the Elements of Harmony can stop it. What happens when the most childish, crazy pony is the only hope of survival? Can anyone stop Agony from ruining pony kind? Or will a new rule of chaos begin? //spoilers from season 3 and season 4//