Maleficent

Maleficent was a title within the Pureblood Sith offshoot group known as the Sorcerers of Tund. It was of a high rank. Those who held the rank were often addressed by their given name, followed by "the Maleficent." The only known holder of the title was the group's leader, Karnak Tetsu.

Behind the scenes
The title of "Maleficent" was first supplied in Part 3 of The Imperial Warlords: Despoilers of an Empire on the Star Wars Blogs on StarWars.com. The name of the title was most likely a reference to the main villain of the same name in Disney's Sleeping Beauty.