Cyprine

シプリン

Cyprine (known as Cyprin in the dub) and Ptilol are jointly regarded as the fifth member of the Witches 5. Naoko Takeuchi stated in the Materials Collection that Ptilol is merely an extension of Cyprine's power, yet they appear to act as a single entity. Cyprine takes her name from the mineral cyprine.
In the anime, Cyprine is depicted as the final member of the Witches 5. She reveals her "other self," Ptilol, only when confronted. These two are not twins but a single person split into two halves. Cyprine is the sole fifth witch, with Ptilol being just a manifestation of her power. United as one, they believe they are unbeatable. They prove nearly invincible to the Sailor Senshi, as one blocks incoming attacks with her powers while the other strikes from behind. Gradually, the Senshi manage to trick them into attacking each other, killing both simultaneously.
In the manga, Cyprine holds the highest rank at level 999, and her death attack is "Ribbon Buster." Kaolinite specifically summons her to deal with the Sailor Senshi. She originates from the Sorcery Class of the Professional Division at Infinity Academy. Cyprine attacks Haruka Tenoh in her apartment. Haruka immediately transforms into Sailor Uranus, and the Inner Senshi, Sailor Neptune and Sailor Pluto, appear to assist their comrades. Cyprine then uses her power to amplify the existing hostility and tension between the Inner and Outer Senshi. Horrified by this maneuver, Sailor Moon attempts to destroy Cyprine with her Moon Spiral Heart Attack, but the attack fails. Cyprine remains unharmed and splits into two halves: herself and Ptilol. Sailor Moon gathers energy from all the Senshi to create the Holy Grail, using it to transform into Super Sailor Moon. She then employs her "Rainbow Moon Heart Ache" attack to destroy both Cyprine and Ptilol.