The Father, desperate for a successor, planted an ancient Jedi distress signal in the Chrelythiumn system that drew Skywalker, Jedi Master Obi-Wan Kenobi, and Padawan Ahsoka Tano to the Mortis realm via a monolith-like gateway. In his desire to escape Mortis, the Son masterminded a plot to turn Skywalker to the dark side as he believed that only the Chosen One could release him from the confines of Mortis. He was voiced by Sam Witwer, who had done voice work for the Star Wars Legends brand prior to appearing in The Clone Wars.

Instead, the Son fatally wounded his sister when he attempted to kill the Father with the Dagger of Mortis, an unintentional act that he came to regret. When in the form of Shmi Skywalker, he was voiced by Pernilla August, and when in the form of Anakin, he was voiced by Matt Lanter. With the Father distracted by the fighting between his children, the Mother drank from the Font of Power and bathed in the Pool of Knowledge, both of which were strictly forbidden by the Father. The Son dismissed the Father's lecture and asserted that while his power continued to grow, the Father became older and even more frail. The Son, later took the Mortis Dagger from his sister's tomb, intending to kill his father with it. As a result, they were also forced to leave the planet as well, stranding Abeloth in the process while searching for a new home. The Son, no longer willing to tolerate the Father's control over his life, attacked him with Force lightning and proclaimed his absolute hatred for the being who had long since hindered his desire for freedom. He was a skilled force user who resided on the force planet known as Mortis. By abducting Ahsoka Tano and stating his intentions to leave Mortis, the Son baited his enemies into a trap that was designed to bring him the Dagger of Mortis and the Father in one place; the only setback in his plan was the Daughter's interference in the Son's attempt at committing patricide. Through his interactions with the immortal beings, he gathered that they each embodied a certain aspect of the Force—the Daughter personified the light; the Son was darkness incarnate; and the Father was essentially the balance that existed between the Force's two warring sides. Locating the Thuruht, a Killik race from Alderaan, the Ones joined the hivemind through the Force. [10] The only times he would willingly work with his Father was when fighting Abeloth. The initial visions that he shared frightened and confused Skywalker, but the Jedi Knight's attempts to resist the visions, in which he saw the outcome of the war and his own dark destiny, proved futile.[11]. [1] As the Son was the embodiment of darkness, his only sibling—the Daughter—existed as a counterpart through her status as the incarnation of the light side of the Force. In addition to her close relationship with the Father, the Mother successfully reconciled the siblings and influenced them in restoring their world to its former glory. In response, the Father threatened that the Son would be contained through force if he did not disengage from his plans to leave Mortis. [10], After imprisoning Tano within his tower, the Son—disguised as a seemingly harmless creature—confronted the Padawan over her inner fears and doubts. The Son promised Anakin that he could avoid his future by joining him. Later the Father ordered the Son and the Daughter to capture Obi-Wan and Ahsoka in preparation for a final test.