Trixie has discovered a way to turn herself from a Unicorn into an Alicorn by draining Princess Celestia and Princess Luna’s Alicorn Magic and Princess Twilight Sparkle's Alicorn Magic with an ancient spell. Princess Twilight Sparkle is in the cell next to the cell that Princess Celestia and Princess Luna are in. Princess Celestia and her sister Princess Luna are trapped within Canterlot's dungeons by the brand new Princess Trixie Sparkle. Princess Trixie Sparkle does try to tell Princess Luna to let out Nightmare Moon. Princess Celestia is normally forced to be quiet by one of Princess Trixie Sparkle’s magical spells.