Caster's True Name is François Prelati (フランソワ・プレラーティ, Furansowa Purerāti?), an Italian cleric in France during the time of Joan of Arc. He was a close friend of Gilles de Rais, helping him with financial difficulties through alchemy. François was also involved with black magic, and Gilles became involved in his rituals as he forgot his original goals. François was the actual magus leading these ceremonies to summon demons, while Gilles was merely a patron involved in the rituals. He owned what became the Noble Phantasm Prelati's Spellbook that is summoned with Gilles under the Caster-class, despite Gilles not actually being a magus. François had translated it from Chinese manuscripts into Italian, and those manuscripts had been previously translated from a non-human language. He was eventually executed and became sublimated as a Heroic Spirit. Despite this, there is a still living François Prelati currently going by the name of Francesca. The Heroic Spirit François possesses no memories from after his initial death.
Prelati had teachers in magecraft who reside in or near a lake, and while they would have wanted to help Saber in the Fourth Holy Grail War, they would have been unable to as there is not enough Mystery left in the world for them to reach Japan from Britain. One of those teachers was in turn taught by Merlin.
True Caster looks like a young boy. He has short stature, white hair, and fancy clothes.
François Prelati, the Heroic Spirit, apparently has a convivial relationship with the living François Prelati; both of which apparently enjoy eating modern snacks together. He also seems to enjoy misery and pain of others and is generally quite relaxed and mischievous.
Day 0 Edit
True Caster is summoned by Francesca Prelati, using her own body as the catalyst. Though initially confused, due to how Francesca perfectly predicted how True Caster tried to introduce himself and initially speculated that his current Master must have summoned him before, and would be surprised if she was still alive if that was the case. However, Caster quickly recognizes Francesca as a future version of himself, relaxing and joking around with her. They discuss Francesca's plan briefly, though Francesca is mysterious about her true intentions. They then complete their contract, though in a joking manner.
Day 1 Edit
True Caster is sent to stop the battle between False Archer, True Archer, and True Rider. He traps them in an illusion, which greatly annoys False Archer, who claims that Caster is beneath even a fool, an imbecile who is drunk on his own eccentricities. True Caster, however, manages to forge a temporary truce between the Servants.
Day 2 Edit
True Caster again serves as a peacekeeper, stopping the battle between the True Archer and his Master, Bazdilot Cordelion, who are fighting True Berserker, his Master, Haruri Borzak, and Fillia, who serves as an ally of Harui, with his Grand Illusion. The Noble Phantasm creates a large hole in the earth where all of them fall, by fooling the earth itself. He then manages to make a truce between the parties.
Day 3 Edit
Caster is present on the airship that functions as his workshop, with Francesca. Onboard the workshop is also Fillia, the homunculi possessed by a goddess, who plans on summoning Gugalanna, the Bull of Heaven. Caster comments that she is kind of scary, but Francesca assures him that she is not interested in fighting them, but two other people on the ground.
Illusionism (幻術, Genjutsu?) is a skill that denotes excellence in the art of illusion within the field of Magecraft. At this level, it is even possible to go beyond people and deceive the environment. Caster has shown capable of generating illusion magecraft, depicting a forest landscape over the ravine that True Archer, True Rider, and Gilgamesh were fighting in moments prior, as well as showing an illusionary replication of Enkidu, an action Gilgamesh declares to be the work of someone below even a third-rate fool. His illusions are said to be able to deceive not only individuals, but the land itself too.
- ↑ 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
 Fate/strange Fake - Volume 4 - Servant status: True Caster [T]
Master: Francesca Prelati
True name: Francois Prelati
Gender: Unknown (summoned Saint Graph is male)
Height/Weight: 152cm 38kg
Alignment: Chaotic Evil
Noble Phantasm: A
■ Territory Creation: B
■ Tool Creation: B
■ Illusion: A
A skill that denotes excellence in the art of illusion within the field of magecraft. At this level, it is even possible to go beyond people and deceive the environment.
■ Disciple of Spirits: B
Proof that one has been initiated in magecraft by certain lake spirits. The efficacy of magecraft improves dramatically.
■ Divinity: E-
Prelati shares the blood of a deity, but as that deity is banished his rank is low.
Barely manifested at rank E due to combination with traditions that link Prelati with Beelzebub.
■ Grand Illusion: The Sunken Spiral Castle Does Not Exist, Therefore There is No End to This World's Madness
Type: Anti-Personnel Noble Phantasm
Maximum Targets: 10 people
Legends that Prelati revealed the form of Beelzebub to sworn friends or that he (she) was the incarnation of Beelzebub combined with the art of illusion and lineage that Prelati originally possessed and sublimated into a Noble Phantasm. It is a great magecraft that surpasses even environment to deceive the very texture of the world. It is even capable of causing a target to hallucinate that Prelati has imprisoned them in a Reality Marble. It is still an illusion, however, and therefore lacks the power of a Reality Marble.
■ Prelati's Spellbook: Textbook of the Sunken Spiral Castle (unusable)
Type: Anti- Noble Phantasm
Maximum Supplement: 1000 people
The result of Prelati utilizing magecraft while dispelling their own rationality with drugs Prelati compounded themselves. Against astronomical odds, it ended up linked to a place one must not link to, Prelati inscribed the truth of it in a blank bible that was a Mystic Code and sealed the link itself. Prelati was therefore incapable of reproducing it, and entrusted the spellbook capable of opening the one and only link to a knight who was their sworn friend. Prelati can never use the Noble Phantasm unless the knight returns it on the spiritual level, but will the day of their reunion ever come?
CLASS 真キャスター■ 螺湮城は存在せず、故に世の狂気に果ては無し
■ 道具作成： Ｂ
■ 精霊の弟子： Ｂ
■ 神性： Ｅ－
 Fate/Grand Order - Gilles de Rais (Caster) Profile [T]
Gilles de Rais - Caster
Illustrator and Voice actor
Voice Actor: Tsuruoka Satoshi
Noble Phantasm: A+
Mental Pollution: A
Eye for Art: E-
Territory Creation: B
Prelati's Spellbook: Textbook of the Spiral Sunken Castle
Type: Anti-Army Noble Phantasm
A French noble from the 15th Century. Having repeatedly committed the deed of abducting young boys from the vicinity of his domains and then disgracing・slaughtering them one after the other, things reached the point in which he became known as the model for the later fairytale "Bluebeard".
Level 1 Bond
Source: Historical fact
Alignment: Chaotic Evil Gender: Male
A holy monster that sought for God more than anyone else.
Level 2 Bond
He was once the owner of a highly pious heart, he fell of deep despair and lost sight of God after Jeanne D'arc was executed as a heretic. His cruel deeds were also a means to prove the absence of God (who supposedly punished such vices).
Level 3 Bond
"Textbook of the Spiral Sunken Castle"
Rank: A+ Type: Anti-Army
A grimoire which in itself is equipped with a magic reactor.
It summons monsters from another world in an inexhaustible supply.
Gilles de Rais is not a legitimate magus himself and has no groundings in magecraft, but in exchange this grimoire can exercise magecraft.
Level 4 Bond
At first, Gilles got involved in alchemy along with his friend, the cleric François Prelati, in order to cover up for financial difficulties, but at some point he lost sight of the original purpose and began to concentrate on summoning of demons.
Level 5 Bond
As others began fearing that he would sell over his domains to an enemy nation in order to raise money, as an excuse for the seizure of his territory, Gilles was convicted for his past misdeeds and executed. The censures towards his blasphemy and cruel deeds were all nothing but political pretenses.
This man, who couldn't help but hold suspicions against God exactly because he extolled God too much and infatuated himself with scornfully curse God, was finally destroyed without being judged by God. Probably, only a Master who shows understanding towards such zeal and despair can perfectly employ him as a Servant.
ジル・ド・レェ - キャスター螺湮城教本
 Fate/Zero material - Encyclopedia: Gilles de Rais [Servant], p.097-098
Gilles de Rais [Servant]
A nobleman from 15th Century France. As a leader in the French army, he fought alongside Joan of Arc to put an end to the Hundred Years War, and was hailed as a hero who saved his country. But soon after he returned to his territory, he began kidnapping, raping, and killing young boys one after another, eventually coming to be feared as the villain "Bluebeard".
However, it was all-too-common in that era for nobles to disregard the human rights of commoners and treat the populations of their territories as disposable livestock. So, under normal circumstances even killing them en masse shouldn't have been treated as anything more serious than animal abuse. But unfortunately for Gilles, he had an enormous amount of land holdings at the time, far exceeding those held by the Duke of Brittany, and enough to be regarded as a threat by the king himself. On top of that, due to his mind-boggling wastefulness in his private life, his public finances were almost entirely depleted, and there were apprehensions that he may try to sell his land to enemy nations. As a result, he was condemned and executed for his crimes as a pretext for seizing control of his assets.
As for Gilles' relation to sorcery, he turned to alchemy in an attempt to relieve his financial difficulties, and eventually strayed down a dark path that led him to try summoning a demon. But while it's certainly true that he participated in the ceremony, the actual magus was his friend François Prelati – Gilles himself was nothing more than a patron. As such, he is not a Heroic Spirit that qualifies for the Caster class. Or rather, he is not even a proper Heroic Spirit at all. The fact that Ryuunosuke's bogus ritual ended up actually completing a summoning sorcery was, honestly, more or less a total fluke. In that sense, the "Caster" Gilles de Rais is just as much of an irregular Servant as the "Assassin" Sasaki Kojirou.
 Fate/Zero - Volume 4: Prelati's Spellbook: Text of the Sunken Spiraled City
Prelati's Spellbook: Text of the Sunken Spiraled City螺湮城教本
- ↑ Fate/Strange Fake volume 4 chapter 10
- ↑ Fate/Strange Fake volume 6
- ↑ Fate/strange Fake Volume 3, Prologue 4: "The Star Performers' Feast"
- ↑ Fate/strange Fake Volume 3, Chapter 7: "The Canon of the Demigods"
- ↑ Fate/strange Fake Volume 4, Chapter 12: "The Gods Return from Twilight"
- ↑ 10.0 10.1 Fate/strange Fake Volume 4, Bridge Chapter: "One Day, Above the Sky"