"First Hassan"

First Hassan, also known as "The Old Man of the Mountain," is a prominent character in the game Fate/Grand Order. He is the original Hassan-i-Sabbah, the progenitor of all Hassan assassins. This enigmatic assassin is known for his skull mask and formidable power. He does not exist to carry out specific missions but rather as a balancing force, appearing to execute those Hassan successors who stray from the righteous path. He wields a massive sword instead of traditional assassin weapons, which symbolizes his unique role. First Hassan possesses immense survivability and a unique combat style, specializing in "instant death" capabilities. In the story, he usually appears as a cold but just figure, showing no mercy to Hassans who violate the doctrine. He is burdened with the mission of purging corruption within the Hassan organization, thus earning the moniker "Hassan Killer." Despite his mysterious identity, his formidable power and strict demeanor have left a deep impression on players. He is not merely a powerful Servant but also an important symbol within the Fate/Grand Order world.