Caster (Fate/Extella)

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Nasuverse character

Archimedes Extella

Archimedes Extella Temporary Everyday

Japanese name: キャスター
Franchise: Fate
Appears in: Fate/Extella
Japanese VA: Kazuyuki Okitsu
Character type: Servant (Master: None)
Servant classes: FGO Caster
Gender: Male[1]
Height: 180cm[1]
Weight: 70kg[1]

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



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


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


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



The Caster Servant Archimedes appears before Nero, who fights for the two Regalia. 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]


Caster 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, ?) is a skill to interpret and restore more or less anything that can be called a formula. 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), ?) is a skill possessed by Heroic Spirits fitting the Assassin or Berserker classes. Implements used gain damage plus against "humans". A condition that Archimedes has even though he doesn't want it. Like a sort of curse.[1]

His Noble Phantasm is Katoptron Katho Phlegon.


  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 Fate/EXTELLA Material - Translated by Comun & Rannoncap
  2. 2.0 2.1 2.2 2.3 2.4 Famitsu - 08/09/2016 Translations by mewarmo990

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