First Korriban Triumvirate

"Three are more powerful than one. Many is stronger than few. The triumvirate will rule the Korriban Empire for eternity."

- Darth Exius

The First Korriban Triumvirate refers to the three Sith Lords that ruled the Sith Empire of Korriban and Liberated Systems from 78,279 ABY - 78,414 ABY.

Origins
"I will not stop, my body will not end until I have the Mask of Darth Kayon and eternal, everlasting life !"

- Darth Exius

The Triumvirate was led by three joint Dark Lords of the Sith: Darth Exius and his apprentices Darth Vethra, and Darth Threx. They succeeded Darth Rehmmus as the rulers of the Sith Empire of Korriban and Liberated Systems following the former's death in 78,279 ABY.

Darth Exius, Death Incarnate
"It takes much power in the Dark Side to extend ones life beyond mortal years. Darth Exius is one of the few who has achieved this accomplishment, but at a horrible cost."

- Ralas Kress, Jedi Knight

Darth Exius was an incredibly powerful Human male who became a powerful wielder of the  Dark Side during the Old Korriban era, believed to have been over eighteen thousand years old when the Triumvirate took power in 78,279 ABY. His immortality was sustained by the pure power of the Dark Side, which had destroyed his homeworld of Eshvada in 60,001 ABY.

Throughout his life, Exius had become obsessed to find all of the most powerful Sith relics scattered across the galaxy, primarily the Mask of Darth Kayon, which was believed to grant eternal life to its owner. Despite training as an apprentice some eight thousand years before he emerged to power, Exius only became prominent in the Korribanite inner circle shortly after the ascension of Darth Rehmmus.

Darth Vethra, Lady of Suffering
"The hate that created Darth Vethra is a powerful one. Such unkempt hatred is fuel to the Dark Side, and Vethra revels in it. It consumes her. In truth, she is more powerful than her master."

Darth Vethra was a female Sith born in 78,250 ABY on  Korriban. She was the result of genetic experiments on Sith purebloods and escaped from the Rosolon Facility on Korriban when she was twenty-two years old, before she was recruited by Darth Exius and trained as her apprentice.

Darth Threx, the Torturer General
"The commander of the Sith armies is a cruel and hateful man. The Sith take no prisoners when Darth Threx leads their armies. They kill the survivors, or worse yet, torture them."

Darth Threx was a Male Devaronian renowned for his tactical skill and penchant for torturing prisoners.