Caster (キャスター, Kyasutā?) is a Masterless Caster-class Servant charged with the security of SE.RA.PH in the Moon Cell Holy Grail War. He is an independent Servant in the conflict and the main antagonist of Fate/Extella.[2]



Caster's True Name is Archimedes (アルキメデス, Arukimedesu?), a "celebrated genius in human history." A mathematician ahead of his time.[2]


Originally, Archimedes lived around c. 287 - c. 212 BC as a mathematician, engineer, and astronomer. He was born to a line of artists, and took up astronomy just as his father did before him. At the time of his death in the year c. 212 BC, he resided in the city of Syracuse, located on the eastern coast of current-day Sicily. Archimedes' famous achievements involve a range of geometrical theorems from "On the Equilibrium of Planes", "On the Measurement of a Circle", and "On the Sphere and Cylinder", as well as "Archimedes' cattle problem" in Diophantine analysis.[1]

While his peers considered him a genius, they also considered him rather strange. Archimedes lived in proud seclusion far from Alexandria, the hotbed of academic pursuits at the time, and preferred written correspondence to face-to-face dialogue. Most scholars of his era treasured recognition just as much as discovery, and basked in the praise of the citizens around them. Archimedes had no such interest, and was said to have been fixated on the beauty and accuracy of his own theorems.[1]

Archimedes was also the cornerstone of Syracuse's defenses, as he was even more talented as an engineer than he was a mathematician. The seaside city-state relied on his supreme war machines far more than it did on ordinary soldiers. Plutarch wrote in his Parallel Lives that Archimedes was related to King Hiero II, the ruler of Syracuse. It is easy to imagine how he ended up in the position of chief engineer tasked with the defense of the city-state. Archimedes' fame as an engineer was known throughout the land from early on. The ancient Greek historian Polybius, born in c. 200 BC, wrote a following account in his Universal History some seventy years after Archimedes' death.[1]

“If you were to see these works, you would easily understand how the intelligence of a single human being can bring about something amazing if they are given proper stage. In truth, the Roman armies who had shown overwhelming might on the planes of both ground and sea were convinced that they would be able to conquer the city-state of Syracuse should just that single old man disappear. However, as long as Archimedes existed, and his methods of protecting Syracuse were in place, they would fear to tread anywhere near the city's walls.”

Many of the defense mechanisms Archimedes invented effectively demolished a variety of would-be invaders. However, in the year of c. 212...[1]

Syracuse formed an alliance with Carthage in the Second Punic War against the Romans, and so Syracuse and Rome became enemies. Consequently, a Roman force led by the General Marcus Claudius Marcellus laid siege to the port city by both land and sea. Archimedes' fortifications effectively repelled invaders, but the city fell to treachery, and Archimedes lost his life in the aftermath. However, his story comes to an end after the siege, rather than during it.[1]

Archimedes' name was well known to the Romans, and the victorious General Marcellus sent out orders that the scholar was not to be harmed. According to popular account given by Plutarch in his heroic tale Parallel Lives, Arcimedes was contemplating a mathematical diagram when the city was captured. A Roman soldier commanded him to come along, but he declined, saying that he had to finish working on the problem. The soldier then flew into a rage and killed Archimedes with his sword. (Plutarch calls this story a mere rumor, and clarifies that there were other rumors as well, like one stating that Archimedes was killed because the soldier thought the technical drawings in his possession would be valuable spoils of war.)[1]

It is said that Archimedes' last words, uttered to the soldier who stopped him while he was drawing geometric configurations in the study, were "μή μου τούς κύκλους τάραττε" meaning "Do not step on my figures/Do not disturb my circles!" Despite those last words being well known, they are not noted in Parallel Lives, and their source remains a mystery.[1]

A bit of trivia: When the Roman orator and politician Marcus Tullius Cicero was serving as a quaestor in Sicily in c. 75 BC, he reported finding the tomb of Archimedes near Agrigentine gate in Syracuse, clearly neglected and overgrown with bushes. It is said that the tomb contained a sculpture illustrating the late scholar's favorite proof, consisting of a sphere and a cylinder of the same height and diameter. This was one of the greatest mathematical accomplishments of his life.[1]


  • Temporary Everyday (一時の日常, Ichiji no Nichijō?) - Archimedes's casual costume.


Archimedes favors logic and rationalism, does not stray from his own views if possible, and endeavors to treat all things with objective dignity.[2]

Archimedes is introverted, stubborn, and active. He is the personification of order, individualism, reason, and rationality. He is loquacious, but while his tone is gentle, there is fire behind his words. He is a curious creature, both social and rational.[1]

Archimedes believes that the world should be peaceful, and does his best to ensure that it is, but he also places himself above this level of reasoning. "Totalitarianism is the best method to achieve societal happiness. That is because we are able to acquire more resources in the most efficient manner by these means. This is how a system should be. Yes, indeed... All human beings, aside from myself, should work for the greater good."[1]

Archimedes approves of a society that is logical, but not necessarily because he dislikes conflict; rather, he thinks it is necessary to sustain a machine with high productivity.[1]

Archimedes believes that the solutions he seeks are paramount to everything else, and he has used everything and anything as mechanisms to help achieve his goals.[1]

The foolishness of humans... The weakness that prevents them from accepting reality for what it is because they prioritize their emotions... This is what Archimedes hates, but it is not a personal dislike so much as animosity towards the overall way humans exist.[1]

Archimedes hates the way humans cannot succeed individually without creating a "hideous" society, and is disappointed in people whose opinions are swayed by their emotions. Thus, it is rare for him to show his animosity in front of people.[1]

Archimedes lived his mortal life as a man who could not see the beauty in anything other that the solutions he created within himself. Because of his great intellect and his broad view however, he was never ostracized from society. Even though he was resigned to the fact that he was "different" from everyone around him, he was also socially adept and magnanimous, and his genius contributed greatly to the advancement of Syracuse.[1]

Other mathematicians of the time only pursued the "beauty of their theorems", and did not concern themselves with the way society should be. And so, Archimedes could even be considered an aberration of his time as he performed work in both math and industry. His dual nature is what led to his conflicted personality as both an engineer in the service of mankind, and an egoist.[1]

After Archimedes becomes corrupted by the Umbral Star, his frustrations with both his own fallings and the foolish commoners all rise to the surface, turning him aggressive. Truth be told, he is in a constant state of anger. He recalls every goal he failed in life... He laments that humanity makes the same mistakes over and over again... His superior intelligence is still his defining trait, which makes him angry about everything.[1]

And so, Archimedes thinks nothing of manipulating others.[1]

As a matter of fact, Archimedes enjoys it. He had always thought that the only things that would move as he intended were his numbers, his creations. But after all this time, he has realized that even the world itself is merely a tool, one he can manipulate to his heart's desire.[1]

So Archimedes hides his aggressive nature with a smile, and finds joy in the way that he can now draw fully upon all of his strengths to achieve his goals.[1]

"Previously, I had only found joy in numbers. Troublingly enough, I now find that my own life is somewhat amusing."[1]

One could even say that Archimedes has finally regained the innocence of his youth. He can even smile at his enemies, as he considers everything a "tool". He recognizes the obstacles before him, but he does not hate them. Even if he was betrayed, as long as the process that led to his betrayal is logically correct, he is satisfied with the outcome.[1]

What he truly dislikes and find distasteful are opponents who have "strayed from logic." He loathes those who would not choose the correct answer when it's right in front of them. His mortal enemies are those who would rampage down the wrong path at full speed ahead without a shread of reasoning.[1]



Prior to the start of Fate/Extella's story, Archimedes is given form as a technician to perform maintenance on SE.RA.PH, chosen by the Moon Cell as a trustworthy administrator for his skills, personality, and merits, but after coming into contact with the harvester of worlds known as the Umbral Star, Archimedes becomes its devoted apostle.[1][2]

When Archimedes interfaces with the once-sealed Ark of the Stars, he becomes corrupted by its influence. He then begins to make preparations so that the Umbral Star can consume the Moon Cell once and for all. Although he acts like a vassal to the Umbral Star, he has no intention of placing himself beneath it. For its part, the Umbral Star has no method to control Archimedes either.[1]

If asked why would he work for the Umbral Star, Archimedes would reply with:

"No reason. I am simply bored of the civilizations of Earth. I want to know about how intelligence of other sentient life forms are constructed."[1]

Archimedes is the mastermind who awakens Altera's deadliest form, the White Titan Sefer.[1]

The Caster Servant Archimedes appears before Nero, who fights for the two Regalias. Archimedes is a standalone Servant summoned as a maintenance engineer for the Moon Cell Automaton, the spiritronic computer that created the spiritronic virtual world SE.RA.PH. He says that the 14,000-year refresh cycle for the Moon Cell's systems is happening right now. However, he declares that the Regalia, articles of authority, are necessary for the system refresh; they are incomplete, having been divided between Nero and Tamamo-no-Mae in an accident. He renews the determination of Nero and her Master to fight, not just for dominance over territory, but to stabilize the lunar world itself, which has begun to show signs of discord.[2]


Archimedes cannot participate in the Holy Grail War due to his position as head of security, but he can still fight even if he cannot compete for the Holy Grail.[2]

Technique Elucidation (術理解明, Jutsu Rikaimei?) is a Skill to interpret and restore more or less anything that can be called a formula. Archimedes can not just repair magecraft, but also damaged circuits and even crests. An esoterica among esoterica even in an age when magecraft still existed. But completely useless in combat.[1]

Aptitude for Slaughter (Tools) (殺戮技巧(道具), Satsuriku Gikō (Dōgu)?) is a Skill possessed by Heroic Spirits fitting the Assassin or Berserker classes. Implements used gain a plus modifier in their damage dealt against "humans". A condition that Archimedes has even though he doesn't want it. It is like a sort of curse.[1]

Archimedes' Noble Phantasm is Katoptron Katho Phlegon, the optical weapon used to burn the warships anchored in Syracuse's shore in Archimedes' legend.[1] Archimedes also possesses an Anti-Fortress Binding Noble Phantasm which he used to seal Titan Altera to get control of the Ark of the Stars. Furthermore, Archimedes is able to set up multidimensional defenses over the Velber's Ark.[3]

Adjacent MovementEdit

Adjacent MovementSliding (並行移動スライド, Heikou IdouSuraido?) is a privilege permitted to Archimedes as a System Administrator (システム管理者, Shisutemu Kanrisha?) of SE.RA.PH, which permits the browsing of Quantum Realities (量子世界, Ryoushi Sekai?), and, within such, the authority to enact transportation (移動権限, idou kengen?, lit. "Authority of Transportation"). A capacity that permits movement between Adjacent Realities (並行世界, Heikou Sekai?).

Originally, the capacity permitted only that browsing be conducted. Even within the domain of SE.RA.PH, the projection of the Consciousness (意識, Ishiki?) and the direct transportation of the Corpus (肉体, Nikutai?) are categorically impossible. Per established record, the Corpus is unable to withstand Temporal Retrogression (時間の逆行, Jikan no Gyakkou?) or the bypassing of The Walls of the Worlds (世界附の壁, Sekai-hu no Kabe?), and collapses if such is attempted.

It was the corruption (浸食, shinshoku?, lit. "corrosion / erosion") of The Wandering Star (遊星, Yuusei?) that permitted Archimedes and Dark Eliza to do so; in becoming profaned by the Spiritrons (Cells) of the Wandering Star, their Existential Integrity (存在強度, Sonzai Kyoudo?, lit. "Existential Strength") was enhanced.

As in the events of the present time, existences such as Archimedes and Dark Eliza were submitted for recording by the Moon Cell, and Sliding will be prospectively disallowed to them as well. The period of time wherein "he wasn't yet identified as an accomplice to the Wandering Star" was to Archimedes the best opportunity by which to maneuver as a saboteur - but even so, his plot came to be foiled.

Incidentally, in the event that Archimedes or Dark Eliza slide into a different world, if there exists a reality similar to the World (Route) of destination, their "analogue" in the World of destination is displaced into the similar reality - merging into the particular existence that is identical to them. In the event that there exists for a given timeline no reality that is similar, a merging into a stronger "self" is enacted.[4]

Machines of SlaughterEdit

The various and sundry inventions of Archimedes. They were each created with some other use in mind, but ended up being turned into tools of war. His inventions are born not of magecraft, but from his own ingenuity.[1]

For example, the Archimedes' Screw (Syrakousón Méthodos or Syracusan Method) made it possible to create the giant warship Syracusia. In short, it's a screw pump used to irrigate water (Syracusia sailed only once, to berth at Alexandria, where she was later given to Ptolemy - Ptolemaios III Euergetes of Egypt - and renamed "Alexandria".) The ancient Greek ship is said to have used a screw-shaped mechanism to expel water from the ship. These screws are also said to have been used in the Hanging Gardens of Babylon.[1]

Archimedes expounded on the principle of the spiral, which his screw employs, in the treatise "On Spirals", which he addressed to Dositheus of Pelusium, a student under Conon of Samos. It is known as one of the first considerations of a curved line that includes a spiral in mathematics of the ancient Greek era.[1]

Another invention was the Claw of Archimedes (Syrakousón Harpage or Syracusan Plunderer), a giant weaponized crane. Archimedes and his associates employed many variations of this device in war. It was originally a machine set on the seaside, used to destroy ships that tried to land in Syracuse. Variations on the Claw could lift invading ships, using a pendular motion to throw them afar, or capture them by throwing a net.[1]

Finally, there's the Scale of Archimedes (Wizard of the Balances), a transportation device that would move even Heaven and Earth if it had the minimum required tools and output to do so. Archimedes theorized about levers and Balance in "The Method of Mechanical Theorems" and "On the Equilibrium of Planes".[1]

According to Pappus of Alexandria, who flourished in the otherwise stagnant period of mathematical studies in the fourth century AD, it was Archimedes' work on levers that promoted his famous quote: "Give me a place to stand, and I will move the Earth." Plutarch, as well, claimed that Archimedes was able to use the pulley and scale to transport objects.[1]

Because of this, Archimedes is called "The Wizard of Balance" within the world of mathematics. In fact, a certain study published on the works of Archimedes, by Kyoritsu Shuppan Co., Ltd., is called "The Wizard of Balance - The Numbers of Archimedes".[1]


  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.19 1.20 1.21 1.22 1.23 1.24 1.25 1.26 1.27 1.28 1.29 1.30 1.31 1.32 1.33 1.34 1.35 1.36 1.37 1.38 1.39 1.40 1.41 1.42 1.43 1.44 1.45 1.46 1.47 1.48 1.49 1.50 1.51 1.52 1.53 1.54 1.55 1.56 1.57 1.58 1.59 Fate/EXTELLA material - Archimedes, translated by ComunCoutinho & RanonCap
  2. 2.0 2.1 2.2 2.3 2.4 2.5 Famitsu - 08/09/2016, translated by mewarmo990
  3. Fate/Extella (English) - Golden Poem Arc: Final Chapter - Soaring Golden Theater