hassan of the cursed arm (fate)
Fate series character. He appears in Fate/stay night, where he is known as True Assassin, and in Fate/Grand Order, where is he known as Hassan of the Cursed Arm.
His appearance is that of a slender, dark man with a skull mask and his oversized right arm wrapped in bandages.
In Fate/stay night, he appears in the Heaven's Feel route as the Servant of Matou Zouken.
True Name: Hassan of the Cursed Arm, one of nineteen people to hold the title of Hassan-i-Sabbah.