Nosuss Trast was born on his backwater homeworld of Dorin. He grew up like any normal Kel Dor child - he went to school. He eventually became aware of his remarkable luck, and the odd tendency for his dreams to come true. Long story short, he discovered his Force sensitivity, and so did some Baran Do sages who began training him to join their order. They taught him how to hone his foresight until the Jedi discovered the young Force user. They tore him from his family and his people and began his training as a Jedi.
Nosuss had his misgivings about the Jedi order; he believed them to be too restrictive and dogmatic. He read through the lines of their teaching and came to the metaphysical understanding that the Force is just as essential to the universe as the laws of thermodynamics. It is a universal law, like gravity or mass. All things participate with the Force. He realized that the Force is nothing more than a universal variable that can be manipulated. Just like he could use chemical reactions to metabolize energy and cause his body to lean forward and his arm to reach out and pick up a pebble, he could focus on the Force and manipulate it to do the same thing. It was a tool that he was especially gifted at using.
Nosuss Trast scoffed at the Jedi Code and the blind dogma of the Order, and eventually left them. He became obsessed with the destructive and creative power of the Force, and believed that with enough knowledge and training of how to manipulate it, he could change the face of a planet or even the galaxy. He joined the Sith Order, for he admired their enthusiasm for self-determination and empowerment. He believed that the Force could create deities out of people, and the Sith philosophy encouraged breaking all restrictions on the self. It was a good match. Then war broke out.
Nosuss hated war. It was the embodiment of futility and hopelessness. He desired the end to all wars, but acknowledged that as long as there were differences of ideas among people, war would be eternal. He realized that the leaders of the Sith were childish, with low hopes and ambitions. They sought to rule the galaxy. But why rule a broken and war-ridden galaxy when one can destroy it and create a new, perfect existence? Why be a slave to the people you govern, when you can ensure that no difference of opinion, and therefore no war, will ever take place? Only the Force has the destructive and creative powers to accomplish this, and as the Sith Code states: “the Force shall set me free.”
Now Nosuss goes along with the Sith while he learns all that is necessary to see his vision come to reality. He keeps in mind the laws of the universe: that all things and beings follow the same metaphysical rules, and therefore have the same value and can be equally exploited.