The plot of Saber's dark route in Fate/Stay Night was as follows: In the last episode of the first season, Saber was controlled by the Dark King and began to go dark. She had lost her original rationality and kindness and became more and more cold and cruel. She kept torturing and killing her clones and gradually grasped the true power of the Dark King. In the process of the dark side, Saber gradually lost her Heroic Spirit Seat and lost her memories and heart as a young girl. She gradually regarded the Dark King's power as her everything and constantly fought for it. The order and method of death of Saber in the dark route included: One of the Dark King's clones, the Dark King's youngest daughter, was tortured to death by Saber. 2 was controlled by the Dark King's power during the battle, causing one of her clones, the Banshee King's clone, to be killed. In the last episode of the first season, Saber was controlled by the Dark King's power during her battle with the Dark King, causing one of her avatars, the Red King's avatar, to be blown up. During the final battle with the Red King, Saber was controlled by the Red King's power, causing one of her clones, the young daughter of the Banshee King, to be tortured to death. Saber's dark route was filled with violence and blood. Her death and the order of her death became the core of the plot.