Artoria Pendragon!!

Summary Saber is the Saber-class Servant of Kiritsugu Emiya during the Fourth Holy Grail War, and then of his son, Shirou Emiya, during the Fifth. Her actual name is Artoria Pendragon, better known as King Arthur, the "Once and Future King" and a legendary hero of Britain. She became king by pulling the sword Caliburn (Fate/stay night) from the stone. Later, the magic sword was destroyed, after which the Lady of Lake gave him Excalibur and Avalon. She is not a true Heroic Spirit, but instead the real Artoria, who made a deal with the World to act as a Servant. She wants to win the Grail to change her past and prevent herself from becoming king so that the tragedies that have ever happened in her life never happens.