Fate Unlimited Battle/Hassan of the Serenity

== Biography ==
An assassin that wears a skull mask.
One of the successive Hassan-i-Sabbah that played the role of ｢Old Man of the Mountain｣ - the leader of the assassination cult - it has been said that while alive she an expert in poisoning endowed with the alias ｢Hassan of Serenity｣.
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.
The outward appearance of a beautiful girl is purely makeshift. 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 and 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.