|Chronological and political information|
During the New Sith Wars, Borthis served as an instructor at the Sith Academy on Korriban. Along with LaTor, Shenayag, Qordis, Orilltha, Kopecz and Kas'im, the Sith Lords were called away from Korriban to meet with Kaan, Dark Lord of the Sith. Knowing that the sith fought against each other for power, the Dark Lord swore any sith would be titled as Dark Lord and fight together against the Galactic Republic and the Jedi Order. The Sith agreed to their new leader, and Borthis was titled as Dark Lord, along with the other sith. After the the waging campaigns ended, the Sith began to form the Brotherhood of Darkness and spread across the galaxy against their enemies.
During the Seventh Battle of Ruusan, Borthis and the remaining were forced to retreat to the Ruusan caves to meet with Lord Kaan and LaTor. They witnessed the creation of the Thought Bomb, a powerful ritual that focuses the willpower of the dark side of the Force. Kaan promised to his followers that they would be immune to the Thought Bomb's effect, and the radius would kill only the Jedi. The Sith followed Kaan's guidance, but they were deceived. When the Army of Light entered the cave, the sith made their final encounter against the jedi and fought until Lord Kaan activated the Thought Bomb, wiping out all nearby Sith and Jedi, killing Githany. The trapped sith spirits remained in the force nexus for all eternity, and the ywould never escape since was Kaan's spirit was the only who left the prison since he was the one who activated the bomb which caused him to flee. Borthis and the spirits were deceived by Kaan's power, and that they would be used until the end.
Borthis' spirit was trapped by the thought bomb, to be held for over one thousand years in what became the Valley of the Jedi. His spirit, along with the rest of the trapped Jedi and Sith spirits, would eventually be released when Kyle Katarn defeated Jerec and freed the souls in the Valley of the Jedi in 5 ABY.
- Darth Bane: Path of Destruction (First appearance)