Caster summoned him to serve as a guardian and watchman at the front gate of Ryuudou Temple. Being an improper Servant, Assassin relies entirely on Caster for mana and is unable to move freely beyond the temple grounds. Additionally, he is missing most of the standard parameters and abilities associated with his class. Due to his limited status, Assassin has little interest in the Holy Grail; aside from his duties to Caster, he simply seeks to enjoy a decent sword fight.
Spoiler
His real identity is Kojirou Sasaki, the famous Japanese swordsman.
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