Darien and his older brother Zane were abandoned by their parents when they were young and forced to live on the streets. Darien has a predisposition for violence, and protected his older brother when they couldn’t talk their way out of a situation. Their master found them a few years after they had been living on the street and trained them to be a cohesive unit: Zane blending in to gather information, and Darien going in to extract the data or person.
His master saw in Darien a bloodlust that he tried to extinguish, but after several failed attempts, decided to train him in the Strong and Gentle fist techniques of martial arts. Darien quickly grasped the Strong fist, but struggled with the Gentle fist, as it went against his violent nature.
Darien was captured by the Empirum and experimented on, the goal to create the ultimate soldier. Darien was the only success out of a group of 100 individuals, and, due to the implants that he was given, black and red ornate tattoos showed up on his body.
Darien escaped from the lab and killed half of the staff on his way out. He became an assassin for hire, killing anyone and leaving no witnesses, going so far to murder an entire space station of people just to get to one man. It was after this that he met Gizel and crew, and after their altercation, Darien escaped.
Several months later, Zane tracked Darien down and convinced him to join the crew of the Voice, but only after he had proven himself loyal by infiltrating the Rekuna Rangers headquarters and giving information to the crew.