Darth Nihilus Profile
One of the three Sith Lords that appeared from Malakor V after the Mandolarian Wars. Probably the strongest of the Sith Lords and the weakest at the same time, his power consists on absorbing the force energy in a range of a whole planet making him more and more powerful, but if he tries to use that power on a place without any force energy he becomes weak and in an extent would probably die; also, the long use of his powers made him loose any trace of humanity he had left, and only a dark energy remained inside his cape and fearsome mask, his own speech is impossible to understand, or at least to most of people. After the defeat of Malak and the disappearance of Revan, Nihilus took over the command of the Sith forces and began hunting down every Jedi on the galaxy. After some time there was about none Jedi left and his feeding with force energy was already an addiction to him, and when the Exile reappeared he immediately began hunting him.
His relation with Traya and Sion is not really well known other than the fact they all trained on Malakor V. During his hunt for the Jedi left on the galaxy, he only left alive a single person who he took as his apprentice, Visas Marr. Either he felt mercy (since he still had some emotions at the time) for her or he saw her useful for her race, while blind, was able to see and detect the force at extremely log distances; Nihilus took out her eyes and left the upper part of her face deformed (thus why she covers it all the time) so her powers would be enhanced and as a way to make her see "the doom of all things" (according to her).
Game of appearance: Star Wars: Knights of The Old Republic 2
