Princess Celestia has trained her three apprentices, Sunset, Trixie and Twilight, to become the newest generation of the Knights of the Realm, protectors of Equestria. Their abilities and morals are unquestionable, and they're also perfectly willing to become the heroes Equestria needs. However, something had to give, and in the process of turning them into the future Legendary Heroes, those three ended up becoming particularly eccentric in their methods and quirks. This is the start of a very silly era of heroes.
October 2019 Edit: The story's rating has been changed from E to T.