During the time of the Clone Wars, Obi-Wan Kenobi, a Jedi Master, Anakin Skywalker, a Jedi Knight, and Ahsoka Tano, a Padawan, all Jedi, inadvertently embarked on a quest to Mortis. While investigating a distress signal that was two millennia old, the Jedi were transported to Mortis by three potent Force wielders: namely, the Father, the Daughter, and the Son.
These entities embodied distinct facets of the Force and held the conviction that Skywalker was the prophesied Chosen One destined to restore equilibrium to the Force. The Father, with the aspiration that Skywalker would uphold the balance between the Daughter and the Son—who embodied the light side and the dark side, respectively—subjected him to various trials to ascertain his status as the Chosen One. Skywalker encountered the spirit of Qui-Gon Jinn, the deceased Jedi Master, and experienced a vision foretelling his transformation into the Sith Lord Darth Vader; this glimpse into the future was subsequently purged from his memory. These ordeals validated Skywalker's role as the Chosen One, culminated in the demise of all three Force wielders, and reestablished harmony on Mortis. Upon their departure from Mortis, the Jedi discovered that time had remained unchanged in the galaxy during their sojourn in that enigmatic realm.
After Admiral Nils Tenant and his Jedi cruiser picked up a distress signal from the Chrelythiumn system that was 2,000 years old, the Jedi Council dispatched Obi-Wan Kenobi, a Jedi Master, Anakin Skywalker, a Jedi Knight, along with his Padawan, Ahsoka Tano, with the aim of investigating the source of the signal. The Jedi made their arrival in an Eta-class shuttle and intended to meet up with Captain Rex on the cruiser he was stationed on. Upon the Jedi's arrival, neither their shuttle nor Rex's cruiser could detect each other. The Jedi's Jedi shuttle then lost contact with Captain Rex. Suddenly, the shuttle was drawn into a monolith, causing the Jedi to lose consciousness.
Upon awakening, the Jedi found themselves on an unfamiliar world saturated with the Force. A peculiar woman, identifying herself as the Daughter, greeted them and inquired whether Skywalker was the One. Subsequently, the Daughter escorted the Jedi to meet the Father. However, a rockslide separated Kenobi and Tano from Skywalker and the Daughter. While Skywalker proceeded to follow the Daughter, Kenobi and Tano made their way back to their shuttle, only to find it missing. Subsequently, Kenobi and Tano encountered a man, the Daughter's brother known as the Son, who informed them that they could not have their ship yet. When the Son questioned Kenobi about Skywalker being the Chosen One, Kenobi and Tano ignited their lightsabers. The Son, however, deactivated them using only the Force, leading Kenobi to believe he was a Sith. The Son stated that he both was and was not a Sith. The Son then directed Kenobi and Tano to seek shelter from the storm in a cave. Following the Daughter's departure, Skywalker entered a monastery and encountered the Father of the Son and Daughter. The Father then offered Skywalker lodging for the night.
While Kenobi and Tano were asleep in the cave, Kenobi heard a recognizable voice. Awakening, Kenobi saw the spirit of Qui-Gon Jinn, his deceased former Master. Jinn inquired whether Kenobi had trained Skywalker as he had requested on his deathbed. Initially, Kenobi drew his lightsaber in shock but retracted it upon Jinn's explanation of the planet being a conduit and amplifier for the Force. Jinn then informed Kenobi that beings like him believed Skywalker was the Chosen One and would find balance there.
At the monastery, the Son visited Skywalker, impersonating his deceased mother, Shmi Skywalker Lars. Believing it was his mother, Skywalker confessed his wrongdoings, including the slaughter of the Tusken Raiders in revenge for her death and his clandestine marriage to Padmé. Shmi informed Skywalker that Padmé was not his true destiny, despite his love for her. She vanished, revealing the Son's gargoyle form.
Back at the cave, Tano heard a voice asking if she was content. Tano saw a vision of her future self. The vision cautioned her that Skywalker was planting seeds of the dark side in her mind and that to reach her full potential, she should abandon both Mortis and her master. When Tano refused, the vision disappeared.
At the monastery, Skywalker confronted the Father with his lightsaber drawn. Skywalker believed the Father was a Sith lord due to his powers. However, the Father asserted he was neither Sith nor Jedi, demonstrating his power by deactivating Skywalker's lightsaber with a touch. The Father explained that he and his children were Force wielders acting as anchorites for the Force. Their Force powers had grown too potent, forcing them to retreat to Mortis to maintain balance in the Force. The Father also had to maintain the balance between his Daughter and Son, who was increasingly drawn to the Dark Side.
Upon learning that the Chosen One had been found, the Father decided to bring Skywalker to Mortis to ascertain whether he truly was the one. Despite Skywalker's skepticism about the Chosen One, the Father decided to test him, promising to let him and his friends leave. The Father had his children, in their animal forms, capture Kenobi and Tano and bring them to his Monastery. In the monastery's courtyard, the Father and Skywalker awaited the arrival of his children.
Upon their arrival, the Father ordered his son and daughter to kill Tano and Kenobi if Skywalker did not choose whom to save. Initially, Skywalker refused, but the Father wanted to see if Skywalker could tame his children. Skywalker was able to use the Force on the planet to compel the Daughter and Son to release them and revert to their humanoid forms. This test convinced the Father that Skywalker was the Chosen One and that Skywalker could replace him on Mortis to maintain balance between the light and dark sides of the Force. However, Skywalker refused to take the Father's place. The Father allowed Skywalker and his friends to leave, knowing that it had to be Skywalker's choice to stay.
As the Jedi's shuttle prepared for departure, Skywalker was confronted by the Son in a dream, posing as Skywalker himself. The Son attempted to persuade Skywalker to succumb to the Dark Side, but Skywalker resisted him and awoke. Unfortunately, the Son had boarded their shuttle and taken Tano to his cathedral. Skywalker and Kenobi crashed their shuttle after losing track of the Son. Despite Kenobi suggesting they speak with the Father, Skywalker decided to rescue Tano from the Son. In the Cathedral, Tano was chained to a wall and encountered a creature who freed her. However, the creature bit her, revealed itself to be the Son, and watched as Tano succumbed to the dark side.
The Son then rejoined his sister at his Father's monastery. Kenobi arrived at the Monastery to speak with the Father. The Son, growing impatient, awaited his Father's death. As the Father sent his Daughter away, he threatened to contain his son if he could not control his powers. Enraged, the Son attacked his Father and flew back to his Cathedral. Kenobi and the Daughter helped the Father to his bed to recover. The Daughter, knowing her brother had to be stopped, took Kenobi to an Altar to retrieve a Dagger capable of killing Force-wielders like her family.
At the Cathedral, Skywalker found Tano. Tano, corrupted by the Dark Side, told Skywalker that the Son would kill her if he did not join him. Skywalker, refusing to let the Son do this, was forced to fight his apprentice. As the Son watched them duel, the Daughter and Kenobi arrived. Kenobi rushed to help Skywalker duel Tano. The Daughter tried to help the Jedi, but her brother stopped her by lifting and tossing her. The Daughter and Son fought each other in their humanoid and animal forms. The Father, sensing this, awoke from slumber and went to the Cathedral.
During their duel with Tano, Kenobi suggested using the Dagger to kill the Son and free Tano. The Son and Daughter continued their fight until their Father stopped them by hurtling them out of a window. Skywalker and Kenobi stopped their duel with Tano when the Force-wielders landed in the courtyard. The Son attacked his father with lightning that slowly weakened him. Upon seeing this, Kenobi and Skywalker decided to use the Dagger. As Kenobi tossed Skywalker the Dagger, Tano grabbed it and gave it to the Son. After receiving it, the Son then drained Tano's life-force with a tap to her forehead. As the Son moved in to kill his Father, the Daughter rushed in and was killed with the Dagger. The Son then departed, and the Father saw that the balance had been broken and the Sith would gain power. As the Daughter died, she asked that her life-force be given to Tano. Upon the Daughter's death, Tano woke up with no memory of what had happened. The Father then told them to leave before the Son could escape using their shuttle. The Father then buried his daughter in a grave with the Dagger.
As Tano repaired the shuttle, Skywalker and Kenobi questioned what to do about the Son. Skywalker decided to travel and speak with the Father about his son attempting to escape. The Father told Skywalker he would eliminate his Son before he could bring about dangers to the universe. At first, the Father refused to accept Skywalker's help, knowing his Son would use him to wreak havoc in the universe. The Father told him to let the Force decide their fates and let Skywalker look inside himself.
As Skywalker left the Daughter's grave, he encountered an apparition of Qui-Gon Jinn. Like the Father, Jinn urged Skywalker to look inside himself. He also told Skywalker to trust his instincts as he once told him. Jinn then told Skywalker to journey into the Well of the Dark Side to face his most personal challenge. The Father spoke with Kenobi at the Jedi's shuttle and told him of Skywalker's destination. Despite the Father's wishes for no interference, Kenobi took a speeder to the Well.
Skywalker descended into the well, where he met the Son in the fiery depths below. The Son once again attempted to draw Skywalker to the dark side by showing him visions of his future. Skywalker saw himself killing younglings and Padmé, dueling Kenobi, Alderaan's destruction, and his future form. Upon seeing these visions, the Son offered Skywalker the chance to change his future, and Skywalker chose to go with him. Kenobi arrived but found Skywalker had been poisoned by the dark side and was left behind. Kenobi contacted Tano, told her that Skywalker had joined with the Son and had to disable the shuttle. Tano was able to disable the shuttle and escape on her speeder before Skywalker arrived. She picked up Kenobi. The Son, knowing that the two Jedi would join his father, went to his sister's grave to retrieve the Dagger.
Skywalker was confronted by the Father, who erased his memory of the visions the Son gave him to free him from the Dark side. Skywalker and the Father were then joined by Tano and Kenobi at the monastery. The Son arrived, and his Father pleaded for him to let go of his plans. When the Son refused, Skywalker, Kenobi, and Tano attacked him to no avail. The Father then took the dagger and stabbed himself to strip the Son of his powers. As the Son made peace with his father, Skywalker killed the Son. As the Father died, he proclaimed Skywalker to be the chosen one due to him bringing balance to Mortis. The Father warned Skywalker to be aware of his inner self, lest he bring about what the Son showed. As the Father died, Mortis dissipated, and the crystal on top of the monastery fell and blinded the Jedi in a flash.
During the age of the Galactic Empire, Skywalker, now Dark Lord of the Sith Darth Vader, and his Inquisitors discovered a Jedi temple on the planet Lothal. Imperial Minister Veris Hydan led Imperial and Mining Guild forces in excavating the temple. By 1 BBY, Hydan's forces then discovered a painting of the Force-wielders known as the "Mortis gods" near the temple's roots. Hydan had found Kenobi's report that detailed these beings and believed they were the key to unlocking the temple and its secrets.