Darth Nyriss
Darth Nyriss
was a female Pureblood Dark Lord of the Sith who sat on the Dark Council for more than twenty years (the third-longest tenure at the time). She was a powerful and ambitious woman, and she openly displayed her status. She called herself "the conqueror of Drezzi" and "the destroyer of Melldia" and lived, at the time of her death, in a well-protected citadel on the western edge of Kaas City, filled with treasures and opulently decorated. Her house emblem was a four-pointed star inside a wide circle. Darth Nyriss appeared to have undergone premature aging as a result of the powerful dark side rituals that she chose to delve in.

Once very beautiful and strong in the Dark Side of the Force, her appearance had degenerated to that of an old hag by the time she met Lord Scourge. Though she could have easily afforded the procedures required to restore her youthful appearance, she chose not to, possibly to flaunt her strength in the dark side or that she didn't care about superficial appearances.

Nyriss was among a group of co-conspirators on the Dark Council who planned to destroy the Sith Emperor, although she never took action. She, along with her ally Lord Scourge, was responsible for Revan's capture on the planet Nathema. She held the Jedi captive for years, until he eventually managed to turn Scourge against her. Scourge betrayed Nyriss to the Sith Emperor, who immediately launched a vicious attack on the traitors. Nyriss confronted Scourge outside Revan's prison cell and engaged him in a duel along with his new ally, Meetra Surik. Nyriss overpowered both her opponents and was prepared to strike them down with all of her power, when Revan, having just recovered his memories, stepped in and intercepted her lightning attack. The Dark Lady was burned to death when her lightning bolts were redirected at her by Revan.

           Star Wars: The Old Republic Villains

Sith Empire
Leader: Sith Emperor Vitiate
Dark Council: Darth Acharon | Darth Arctis | Darth Arho | Darth Arkous | Darth Azamin | Darth Baras | Darth Charnus | Darth Decimus | Darth Drear | Darth Ekkage | Darth Hadra | Darth Howl | Darth Igrol | Darth Jadus | Darth Karrid | Darth Marr | Darth Mekhis | Darth Mortis | Darth Nox | Darth Nyriss | Darth Ravage | Darth Thanaton | Darth Vengean | Darth Vowrawn | Darth Zhorrid
The Empire's Wrath: Scourge
Sith Lords: Aloysius Kallig | Ashara Zavros | Darth Andru | Darth Angral | Darth Atroph | Darth Cendence | Darth Chratis | Darth Fastus | Darth Glovoc | Darth Gravus | Darth Ikoral | Darth Jaga | Darth Kallous | Darth Lachris | Darth Malgus | Darth Minax | Darth Nurin | Darth Ouzal | Darth Sajar | Darth Serevin | Darth Silthaar | Darth Skotia | Darth Sorranos | Darth Tormen | Darth Venemal | Darth Vich | Darth Viktus | Darth Vilus | Darth Xedrix | Darth Zash | Jaesa Willsaam | Khem Val | Lord Draahg | Lord Nefarid | Lord Praven | Lord Sadic | Lord Tarnis | Lord Vivicar | Vemrin | Vindican | Xalek
Military: Lieutenant Pierce | Malavai Quinn | Moff Broysc | Sith Trooper

Revan and Malak's Sith Empire
Bastila Shan | Calo Nord | Darth Bandon | Darth Malak | Darth Revan | Darth Voren | Saul Karath

Sith Triumvirate
Darth Traya | Darth Sion | Darth Nihilus

Eternal Empire
Leader: Arcann | Valkorion | Vaylin
Soldiers: Knights of Zakuul

Other Sith and Dark Jedi
Atris | Bengel Morr | Haazen | Ludo Kressh | Marka Ragnos | Naga Sadow | Simus

Andronikos Revel | Eagle | General Vaklu | The Great Hunt Champion | Hunter | Rakghouls | Star Cabal | Tarro Blood | Visquis