Darth Krayt's Sith trooper

Sith troopers were individuals, strong with the force, which were abducted by Darth Krayt shortly after birth and were augmented and improved through cybernetic implants. They were programed into warriors with unquestionable loyalty to Krayt. Krayt had began his Sith trooper project decades before the One Sith took over the galaxy. Knowing that all of his Sith followers sought his power, Krayt formed the Sith trooper project to create an army that was both completely loyal to him, and undefeatable. After Krayt's resurrection, he started implementing his Sith troopers and his Annihilator starfighters in his war.

The troops were housed in a secret location in the Valley of the Dark Lords on Korriban