Remulus Dreypa

Dreypa was a Sith Lord who lived at some point prior to the Mandalorian Wars. During his life, he created an oubliette which would cause a being inside it to endure a living death, and was immune to sensors. This oubliette later came into the possession of Pulsipher who threatened to place Zayne Carrick into it if he did not tell Pulsipher how to use the Muur talisman.