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Assassin
アサシン
The Hundred-Faced HassanHassan-i-Sabbah
Assassin's identity is that of the legendary Persian "Old Man of the Mountain," Hassan-i-Sabah the leader of al-Assasīn.
Assassin serves as the Servant of Kirei Kotomine in the 4th Holy Grail War, his unique trait being that he can manifest as multiple entities at once.
(Source: Wikipedia)
