"Oh, don't fear me, my dear Twilight Sparkle. I am still your Princess. Except, now that I am no longer clouded by conscience, remorse, or delusions of morality, I have become what I am truly meant to be - divinity, UNLEASHED."
"No! This...this isn't right! The Celestia I know would never say anything like that! She...she would never call mercy and compassion 'delusions!' What happened to you?!? You forgave Luna when she almost destroyed the world; you forgave me when I drove Ponyville mad over my homework... (tearing up) W-what happened to you?!?"
"What happened? You know what happened! I looked back at the past and finally realised that your failures almost destroid Equestia on multipule accounts! If it wasnt for your Elements of Harmony, Nightmare Moon, Discord, Queen Crysalus, or worse yet ALL THREE could be running around freely! I opened my eyes Twilight! I now know that I must rule by force and by darkness if I want to protect MY kingdom! Friendship is no longer magic, but instead it is now replaced by hattered!"
nah, Celestia just used simple illusion spell to acquire season3 villain eyes and show Twilight what hatred and black/dark magic can do in Equestria. But ofc now everyone will start drawing perfect good sun princess as a demonic evil princess (it seams that people forgot about Nightmare Moon)