One of the nineteen Hassan-i-Sabbahs. A female version, and one who seems to be one of the best. Countless Servants have fallen because of her Noble Phantasm, and out of all the Servants in the Duel-Chart, she has the highest kill-count. Even so, she does not kill indiscriminately, and is in fact one of the calmest Servants around. It is rumored that she bears a great resemblance to her Master’s mother.
Many tales and rumors circulate about this mysterious Servant, and it is often argued, whether is, in the end, more deadly: Her Mystical Eyes, or Noble Phantasm. Compared to a single-target-Black-Plague itself, this Assassin is avoided by most members of the Ryougi faction, simply because death seems to follow in her wake like a shark trailing a wounded prey. Why it is so, no one knows. Yet no one is foolish enough to try to find the reason. Only Assassin, and her Master, know the truth.