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 Blue and Silver. She later forms a new contract with Manaka Sajyou.
Assassin's True Name is Hassan of Serenity (静謐のハサン, Seihitsu no Hasan), one of the nineteen Hassan-i-Sabbah. It has been said that while alive she was an expert in poisoning, the legendary "poison girl" 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. She has become the source of the urban legend by the name of Mary (メアリーさん, Mearī-san).
Description[]
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LOTM: Weirdmageddon[]
Hassan of Serenity will appear once Kurome summons her from an old poisoned dagger item given by Kirei Kotomine.
