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Assassin (アサシン, Asashin?) is the Assassin-class Servant of Seiji Jinga in the First Holy Grail War of Fate/Prototype: Fragments of Sky Silver. She later forms a new contract with Manaka Sajyou. She is also one of the Servants able to be summoned by the Protagonist of the Grand Order conflicts of Fate/Grand Order.



Assassin's True Name is Hassan-i-Sabbah, given the appellation of Hassan of Serenity (静謐のハサン, Seihitsu no Hasan?), one of the nineteen people to hold the legendary title of "Old Man of the Mountain". It has been said that while alive she an expert in poisoning, the legendary "poison girl" or Visha Kanya told in many ages, many parts of the world starting from India of the BC era - fabricated by the assassination cult as a weapon, a tool for assassinations in real life. That is her identity.[1] She has become the source of the urban legend by the name of Mary (メアリーさん, Mearī-san?).

She is known for silently take away the lives of kings, nobles and military generals in their sleeping quarters. In many cases, she would establish a relationship of lover or fiancee with her assassination target. In other words, she kept repeating the deed of building with her own hands an "artificial happiness" that would not be fulfilled, just to steal it away with her own hands. Gradually, her mind creaked. As for her final moments, maybe a general from a certain army took her head due feeling suspicious of her behavior of not even holding hands, or maybe she herself revealed her identity as an assassin and pestered the general "please, kill me..." Or maybe, she was put to the sword while the general has taken his eyes off her.[1]


Assassin's appearance is typical of those in her order. Like all of the other Hassans, she wears a black, form fitting outfit and the traditional Hassan's skull mask. Her outfit is very similar to the one worn by the female personality of the Hundred-Face Hassan, her violet colored hair being another trait they share.

Unlike the Cursed Arm Hassan, Serenity never actually carved out her face, as it was one of her greatest tools. Her Shape-Shifting allows her to better refine her features to lure in her targets. Due the nature of her assassination methods, she has natural looks.[1]


As an assassin, Serenity is very pragmatic with her methods. After losing her master, she took to killing other men to maintain her existance by luring them to her thanks to her appearance.

As natural of her previous profession, Assassin is quite skilled at deception, particularly in lying to others. She was able to quickly come up with a believable lie to explain to Ayaka upon her encountering Assassin as to her presence in the Sajyou's home, while also analyzing her words for any potential holes and finding ways to cover them up.

If Serenity had a wish, it would likely be to be able love and touch another without killing them. It was for this reason, that she likely did not stop her first master from trying to kiss her, which resulted in his death and why she choose to follow Manaka, as she was unaffected by Assassin's poisonous body.


Fate/Prototype: Fragments of Sky SilverEdit

  • "From the moment that I killed you I've been in love with you..."

On the first day of the tournament, Assassin is summoned by her Master, Seiji Jinga in an abandoned warehouse in the Tokyo Port area. Going up to Assassin, Seiji gets instantly captivated by her allure and despite Assassin being not very conscious, makes the mistake of kissing her.

Seiji then dies by Assassin's Zabaniya: Delusional Poison Body making him the first master to be killed in the 1991 Tokyo Holy Grail War, albeit accidentally.

After she loses her Master, she takes on a human appearance in order to lure men to their deaths. She then consumes their souls in order to maintain her existence which leads to the spread of the "Miss Mary" rumors. It is during one of these that she meets Manaka who becomes her new Master.

She is responsible for the deaths of Tatsumi Kitano and the Isemi Clan, using her Noble Phantasm to kill them. She's killed many men, however, after the act, she finds she cannot stop thinking about Tatsumi, who's peculiar behavior of trying to protect her knowing she would kill him left her with confused emotions.

Caster would later retrieve Tatsumi's corpse and revive it as a ghoul familiar and present it to Assassin as a gift in order to divert her attention away from Manaka. While initially horrified, she came to cherish her time with Tatsumi and fell in love with the boy, who she could now embrace and kiss as she desired without killing him again. She later assists in the battle with Ozymandias, as well the one against a maddened Brynhildr, and loses an arm to the Lancer. Later on when Tatsumi's reanimated corpse has developed enough sentience to attempt to stop Manaka from sacrificing the lives of innocent girls and Manaka prepares to kill him, Assassin unthinkingly wraps her arms around Tatsumi, crying hysterically as she desperately pleaded for her Master to spare him.

Afterwards, knowing everything would soon be coming to it's end, she came to understand what she was doing a mere mockery of the life she had wished for, so in an act of mercy, Serenity tearfully apologizes for keeping the boy with her so long, confesses her love she felt for him since the moment she killed him, and finally put him to rest.

During the last part of the war, she faces Saber to give Manaka more time and to prevent him from reaching the Greater Grail in a final act of duty and loyalty to her. She winds up defeated by Saber's blade. As she fades away she battles against herself between her devotion to Manaka and her feelings of wanting to protect Tatsumi's younger sister, who was also in the town. Her last thoughts were of Manaka who, like her, also came to love someone.

During Saber's battle with the Beast, Assassin appears again in Saber's mind. She encourages Saber to fight and then becomes one of the Servants who lends Saber her power when Saber activates Excalibur.

8 years later, a shadow of Assassin is seen again as one of Manaka's faithful Grail corrupted Servants.

Fate/Grand OrderEdit


She appears as an ally in Camelot, first appearing in the fortress in the dungeon as a prisoner by Agravain.

Other appearancesEdit

Assassin is briefly mentioned in Fate/strange fake by False Assassin.
TMAPRIL 2015 Momoiro Hassan Z

Type-Moon April Fools' Day 2015

In Type-Moon's April Fools' Day 2015, Assassin is in a female group called Momoiro Hassan Z (ももいろハサンZ, Momoiro Hasan Z?) and is part of the Imperial Roma talent agency, her class is Stealth idol (ステルスアイドル, Suterusu Aidou?).



Assassin's parameters

Assassin's most notable trait is her Noble Phantasm, Zabaniya: Delusional Poison Body. Her body resists all sorts of poisons and, at the same time, is a lump of poison. Let alone her nails, even her skin and body fluids would act as deadly poisons.[1] It makes the entirety of her body poisonous to the touch and even the sweet aroma that emanates from her is poison in and of itself. She prefers embracing her victims and kissing them on the lips, using the poison to fry their brains in a few seconds, but any form of contact with her is fatal, no matter how small.

She possesses the skill of Independent Action. It is high enough for her to be able to survive for a few days after she kills her Master, while still consuming human souls.

Her Shapeshift skill allows her to disguise herself. She usually takes on the guise of a pure and innocent looking maiden and her appearance is extremely bewitching to men, who look at her full of lust and disregard caution just to go to her. Even in her Servant form, she is still shown to be extremely alluring.

Just like the other Hassans, she also wield dirks for both short-range and long-range combat, slicing up her opponents in an instant with dance like movements. However, unlike the dirks wield by the Cursed-Arm Hassan or the Hundred Face Hassan, her personal dirks are white kunai-shaped daggers.


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