Mistress 9

Mistress 9 is the Sovereign of Silence, and the one commanding Doctor Tomoe in Sailor Moon S.

Tomoe's daughter Hotaru was chosen to be the one possessed by Mistress 9, who then commanded him to extract Pure Hearts to find the Purity Chalice so she could awaken her master, Pharaoh 90. Once Sailor Moon got the Purity Chalice, Mistress 9 commanded Tomoe to extract Pure Hearts to feed to her. Eventually, Kaorinite brought her Rini, and she ate her Pure Heart and awakened in her true form. She then killed Kaorinite with a lightning bolt, as she did not need her anymore. She sent Tomoe after Sailor Neptune and Sailor Uranus when they entered, resulting in Germatoid leaving Tomoe and being killed by Sailor Uranus.

Mistress 9 tricked Sailor Moon and the un-possessed Doctor Tomoe into giving her the Purity Chalice, and she used it to summon Pharaoh 90, destroying the Purity Chalice. However, Hotaru was able to fight her from within, and overpowered her with her memories of her father and Rini, destroying her completely.