saber is a Servant with the class "Saber" summoned by Emiya Kiritsugu during the Fourth Holy Grail War. During the Fifth Holy Grail War, he made a contract with Emiya Shirou. Her real name is Artoria, the legendary King Arthur of Britain, also known as the "King of Knights". Abide by the spirit of chivalry, be loyal and upright, be humble and courteous, and have a serious personality. He is a fair and honest king, loves his people more than anything else, and always puts honor and dignity first. Self-esteem, self-confidence and competitiveness, he will be keen on winning and competing and ignore the things around him. He likes to eat delicious food and is full of energy for it. Strictly speaking, she is not a normal "heroic spirit", but a "person classified as a heroic spirit" and is considered a living person. This is because she made a contract with the "world" when she was dying. In exchange for becoming a heroic spirit after death, Arturia's only wish for the Holy Grail is to "remake the king's choice"

Now Artoria's body remains motionless at the moment before her death, and time is at a standstill. Therefore, I am very unaccustomed to the spirit body, or in other words, the spirit body cannot. Frozen in time until summoned. To break the contract, she must destroy the Holy Grail with her own will. Generally regarded as one of the best Servants, not only has good analytical judgment, but also can display unimaginable bravery in battle. "Saber" is proud to have the most outstanding strength in the previous Holy Grail Wars. Artoria's strength comes from her sword skills and extremely high magic power limit. Most of her magic power is used for defense, and the silver armor she wears is woven with magic power and can be put on and off instantly. It takes more magic power to repair armor than to repair damage to the body. The amount of mana restored is 8 per day, and the amount required to maintain the body is 6, so it is calculated by increasing by 2 per day. However, if the opponent is a Servant, a single battle will consume anywhere from dozens to hundreds. It has a special defense bonus against shooting weapons, and can also read the track by listening to the wind and intuitively. She was originally born as a prince of Britain, but because she was a girl, she was fostered by the retainer Knight Ector. The wizard Merlin once predicted that she would one day pull out the sword in the stone (Caliburn) and become the new king of Britain. After pulling out the Sword in the Stone, her growth stopped due to the magic power of the Sword in the Stone. From then on, she gave up her identity as a "human" and became a "king". She no longer considered her own feelings and only worried about the country and the people. After becoming king, he gallops on the battlefield like a man. In ten years, he won twelve consecutive battles. However, since she has always maintained the appearance of a young girl after picking up the Sword in the Stone, she has caused concern and distrust among her subjects.

King Arthur is the red dragon that protects Britain (this statement may be attached to the red dragon family emblem used by the Pandagon family). As a person with the dragon factor, there is no need to use magic circuits, as long as the blood circulates and absorbs In one breath, magic power can be generated, which is a "magic furnace heart" of a different dimension than a magician. Whenever Britain is in crisis again, King Arthur will turn into a fire dragon to save them. Since he has the "red dragon" attribute, as a Servant he will be at a disadvantage when encountering a hero with dragon-slaying attributes. He has a strong appetite and seems to have been unable to enjoy delicious food during his lifetime. He is obsessed with eating in the name of replenishing his magic power and is quite interested in collecting recipes. No nasty food, except octopus. My favorite type of opposite sex is someone who is strong and forward-looking, that is, someone who works hard to overcome difficulties. In addition, she has an excellent drinking capacity and can hardly get drunk after a thousand drinks. But having said that, your body's growth has stopped before you become a Servant. No matter how much you eat, you won't get fat, and you won't lose weight if you don't eat. I once lived with a lion cub for a month, and I have been very concerned about the lion since then. It is generally believed that the dull hair on the head (a character attribute drawn in Japanese anime) was shaved off by King Rikona when he became king. It seems that the honor of protecting the country in the future = protecting the dull hair on the head, not even the princess. Touch allowed. If touched, it will reflexively enter a defensive state. If it is caught being stupid, it will immediately turn black (not contaminated by the shadow but transformed into the dark side), and its favorite food will also become junk food. Sometimes you are armed unconsciously while dreaming. Being protected by the Lake Spirit, you can walk on the water, but you can't swim. My recent hobby is collecting menus, and I have a weak sense of money. He is good at equipment sports and gambling, likes fine food and lions, and hates rough food and too many decorations. His card skills are superb, whether it's ghost cards or blackjack, he not only has great luck, but also has overwhelming strength. He can beat the trio of Sakura, Rider and Tiger (fate/ha) at blackjack without even taking it seriously. Her casual clothes were given to Rin by Kotomine Kirei, who later gave them to her. The pajamas are kimonos with white background and blue flowers.

During the battle, he gradually felt Shirou's love for him, so he often showed his side as a girl later on.