Kellen spent his early years helping his mother and older brother, Lan, run their small farm on the grassy plains of Talus while his father helped with their meager living by smuggling machine parts out of the Corellian shipyards. He always dreamed of joining his father in soaring into the stars, but needed to keep his head on the ground to help raise our sparse crops and protect them from Selonian raids - a fact his brother was always quick to remind him of.
He discovered that he was different from other farmhands during a hike into the mountaintops of Kystes' Spine. When he slipped and fell from a 30-foot cliff he was already able to walk away from the incident with nothing but a broken rib or two. Lan began to realize that he had similar abilities as well. However, their parents refused to listen to their amazing tales and told them to thank the Force for sparing their lives. They also taught them to fear and hate the unique order of Corellian Jedi, who strutted around the system with robes of bright emerald green and heads the size of Yavin moons, punishing those who participated in illegal smuggling activities with the same cold, calculated moves of brainwashed stormtroopers. Hate of the Jedi dominated Kellan's thoughts, though for some reason Lan was taken with their cocky views of justice and dreamed of donning a green hood and lording over the Five Brothers of the Corellian System along with the other Force-wielding snakes.
Kellan's childhood ended the day the Jedi managed to follow their father back to their tiny farm. When he refused to reveal his stolen goods, they attempted to seize the missing property by force, which resulted in a terrifying duel between lightsaber and blaster fire. The images of burning crops, thick smoke choking out the daylight, and his small mother screaming as she watched her struggling husband get cut down by a gleaming blue lightsaber were forever etched into his mind, and continued to haunt his sleep. Kellen managed to survive only by fleeing and disappearing in the nearby mudlands, and he has striven to remain mostly invisible ever since.
Orphaned by the Jedi, he searched the galaxy for the Sith Lords he used to hear about from visiting smuggler friends of his father, hoping they will teach him to use his strange gifts for one single purpose - revenge against the Jedi filth, the hypocrites who spoke of peace before robbing him of his. He has not seen his brother since that dark day and fear the Jedi may have captured him.
He joined the Order of Sovereignty and took part in the League of Shadows for a time until being assigned to Bastion to track down a possibly spy within the Order of Sovereignty. He never returned from the mission and has been listed as MIA since then.