Son blasted Father in back with Force lightning, nearly killing him, just as Kenobi arrived to seek the Father's help. After poisoning her to the dark side, Son returned to his father's side, who became concerned with his immersion into the dark side. However, the Son boarded their ship while they were in flight, kidnapped Ahsoka Tano, and forced the ship downward. Nonetheless, Father respected Skywalker's decision and allowed for him to leave Mortis with his companions. Anakin Skywalker refused and Father warned him that his selfishness would haunt him and the galaxy. He revealed that he was dying and only the Chosen One could contain his children when he died. It was then that Father revealed his true purpose: he wanted Skywalker to replace him. When Skywalker defeated them both, Father declared only he and the Chosen One could control both his children. Father had ordered them to kill the Jedi Master and Padawan, and told Skywalker to choose who to save. The Son and Daughter had taken Ahsoka Tano and Obi-Wan Kenobi, respectively.
Skywalker would find out that the test was soon. He suggested a test, to which Skywalker agreed. He then discussed the matter of the Jedi being the Chosen One. Father merely grabbed the blade and deactivated it. Accusing the Father of being a Sith Lord, Skywalker held his lightsaber to him. But when the Son visited Skywalker in the form of his mother that night, he assumed it was the old man. However, after the death of The Mother, The Father decided that the only way to save the universe from the unlimited powers of his children was to remove them and himself from the real universe and settle in another dimension as gods of the force.When Anakin Skywalker approached the Temple of Mortis, the Father offered him a place to stay the night. Fearing a conflict between the two could result in a terrible cataclysm throughout the universe, the Father attemted to use his superior strength and experience in the force to keep the balance between his children. As these children grew, the Daughter veered towards the light side, and the Son drifted ever closer to the Dark. Prior to the Clone Wars, during the age of the old republic, The Father and another being named The Mother produced together two children named only Son and Daughter, who were, like their parents, incredibly powerful with the Force. By doing this, he removed all power from his Son and Skywalker took the chance and impaled the Son with his lightsaber. With a final confrontation about to be set between the Jedi and the Son, Father decided it was best to remove himself from reality by taking the Dagger away from his Son and stabbing himself with it. She sacrificed herself to save the Father, bringing unbalance to the Force. While attempting to keep peace between them, the Daughter was impaled by the Son, who had the Dagger of Mortis found in the Altar of Mortis. When the Jedi Obi-Wan Kenobi, Anakin Skywalker, and Ahsoka Tano visited the planet, the Father attempted to stop a confrontation between his children, the Son and Daughter. The Father was a male being descended from the celestial named Yeva who was part of The Ones, a family of powerful Force-users on Mortis during the Clone Wars.