this is why she a work harder than befor for not only the sake of all equestria but for her little sister return! the tragedy of the princess of night is reason why celestia is a great character ,she a learn from her Mistake for the sake of equestria but most than all , her Sister! and i with you a 100% is the fault of the citizen of the past , the same who be fighting to a other befor equestria be made! the pony's and other Creature of the past are Idiot's. Thanks to tham the Monster of Nightmare a born in the heart of the poor luna and she a grow up with it and late is past to the point of none return, Celestia a try to reasoned with her sister but is end in battle and Celestia lost it and she a no choice to use the element of harmory and seal Nightmare moon and lose Luna in the same way, Celestia dont know the element can purefied other too but she dont know it , Celestia a be very angry and destroy the element of Magic and the 5 other turn to stone, but befor she destroy the rest of the elements a mysterieuse Unicorn mare a tell Celestia the future, this is the reasion why she a create her magic school for unicorn to fond the pony she need to safe her poor sister, of course Celestia a made many mistake and learn from it! lose agains bug face by not use more power she a use agains her!(many fan belive Celestia is weak but no bug ass a cheat in the battle by use shining armor love for cadance!)