"Kiritsugu, let me reiterate this once more. Over two hundred years ago, our Einzbern Family obtained this unexpected boon through a magecraft transaction with the Zolgen Family. After our investigation and verification, we have confirmed that this is the Holy Relic capable of summoning the strongest Servant."
In the center of the Einzbern Family's chapel, the head of the Einzbern Family, Jubstacheit von Einzbern, looked down at Emiya Kiritsugu, who knelt before him, and spoke in an utterly flat tone.
"This is the greatest support we Einzbern can offer you."
Not even the slightest trace of emotion could be found in Jubstacheit's eyes.
"I am deeply honored, my lord."
Kneeling before Jubstacheit, Emiya Kiritsugu lowered his head and answered obediently.
He knew exactly what sort of being the man before him was.
Jubstacheit von Einzbern was one of the homunculi personally created by the disciples of the Third Magician. He was a creation from the same era as Justeaze Lizrich von Einzbern, the Saint of Winter. Yet unlike the Saint of Winter, the essence of the puppet Jubstacheit was a terminal that controlled the operation of the entire castle. Every homunculus produced by the Einzbern Family afterward had come from Jubstacheit's hands, which was why he was also known as the [Father of Homunculi].
Of course, because of the passage of time, this puppet designed to operate the castle had encountered a problem similar to that of the Saint of Winter—his personality had long since vanished. All that remained was the intellect that continued running the castle, along with directives such as [value the Third Magic]. Any humanlike behavior was merely the result of the humanity implanted within the terminal imitating such behavior on its own.
Even so, he was the true controller of the Einzbern Family, someone Emiya Kiritsugu