Hassan of the Serenity

Hassan of the Serenity, also known as Seihitsu no Hassan, is an Assassin-class Servant featured in Fate/Grand Order. She is one of the successive Hassan-i Sabbahs, renowned for her mastery of poison assassination and known as the "Hassan of the Serenity" during her lifetime. She appears as a young woman with a skull mask, but her body is both resistant to all poisons and is itself a deadly source of poison, including her skin, bodily fluids, and even her breath. She excels in stealth assassination, often using her beauty to lure targets before applying poison through touch or kissing. Despite being composed during assassinations, she yearns for connection but is unable due to her toxic nature. Once serving under Manaka Sajyou, she also fell in love with the revived Tatsumi, ending her life tragically. In the game, Hassan of the Serenity is a unique Servant, skilled in controlling and weakening enemies through poison and damage over time, with a chance to inflict instant death. Her skills boost poison and debuff effectiveness, reduce enemy NP charge, etc. She craves love, while realizing her poisonous existence prevents her from touching others, which makes her a tragic character.