Najus wanted to get revenge in a personal feud against the Jedi Order. Towards that goal, he decided to carve a Sith artifact, an item that would interact with the dark side of The Force, increasing the power of the darksider using it. The result, the elaborately-adorned Bracers of Najus, indeed boosted the effect of the dark side power of the wielder whenever that power was used against a user of the light side; however, if the target of an attack resorted to the dark side of the Force, the Bracers would benefit the target.
The Bracers of Najus were lost when the Sith starship in which they were crash-landed in the planet Leritor. Years later, in 30 BBY, dark side adept and scholar Profex Rynalla found a trail to the Bracers in the archives of the University of Sanbra and went to Leritor with Klatooinian minions to recover Najus's legacy. She hoped to find the Bracers in the remains of the ship.