Episode 123. After stealing Chibiusa's pure heart and awakening Mistress 9 collapses the pocket dimension Professor Tomoe used as the Death Busters' headquarters and kills Kaolinite with a lightning. Also, she destroys the barrier that knocked down Uranus and Sailor Moon before.
The destruction of the Pocket dimension destroys part of the Mugen Academy.
And it's revealed in episode 124 that Mistress 9 isn't fully awaken.
The destruction of the Pocket dimension destroys part of the Mugen Academy.
And it's revealed in episode 124 that Mistress 9 isn't fully awaken.