Celestia show to her people not powerful and easy she be defeat but in reality she not weak that all, when Twilight and her friends go safe the day, Celestia her let a copy of self to watch over equestria when her real self go fight a army of demon to make sure NO demon come in equestria and she rip and tear them, slash and destroy them, she show no mercy to any demon but she still looking but demon who have kill her parents and turn luna to nightmare moon, the new power Celestia use is call the sacred light and more powerful then the elements of harmony but do not have power to reform any demon, beside she want to destroy them, this is a side of her she do not want of subject see of her, not sister, not niece and mostly not Twilight