Through an agreement between the Mages ' Association and the Church, the Holy Grail Wars are moderated by a priest. Kirei served under the Fourth Holy Grail War 's priest moderator, his father Risei Kotomine, before taking over the position despite being an acting magus. Although Kirei understood the distinction between good and evil, he could only revel in committing sins and accepted that side of himself after attempting to redeem himself. Originally the master of the Assassin of the Fourth Holy Grail War, Kirei secretly murdered Tokiomi to obtain Gilgamesh while becoming an indirect caretaker for Rin. It is also revealed in the prequel Fate / Zero that he is responsible for the fire that killed Shirō 's biological parents, having indirectly wished for it with his dying breath after being shot through the heart by Kiritsugu Emiya. Ranked far lower in the Church hierarchy than Ciel (from Tsukihime), Kirei employs many of the same techniques and weapons she does, as well as a powerful martial art called "Super Bajiquan '' that allows him to not only match, but also defeat low ranking servants, something the aforementioned Ciel can not do. He can also perform the Baptismal Rite, an immensely powerful holy sacrament used to exorcise demons. Kirei is also skilled at spiritual surgery thanks to his "Open Wound '' Origin. He is surprisingly powerful as a Magus, having trained under Rin 's father. Sometime before the start of the Fifth War, Kirei became Lancer 's master with Gilgamesh acting on his own accord.
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