Medea's and Medusa's wishes were easy to fulfill. In fact, both women's wishes had changed somewhat. When Medusa was summoned, she could be said to have had no particular interest in the Holy Grail; she had only been summoned because she shared similarities with Sakura Matou.
The remaining people were even easier to satisfy. Sakura Matou was already perfectly satisfied with the way things were. Once the Holy Grail War ended and Karn used the Greater Holy Grail to punch through the world, there would be nothing more for her to do.
Illyasviel von Einzbern had also wanted to reach the Root because of the Einzbern Family's mission. But after she became fully human-or rather, a magical girl-her interests gradually shifted elsewhere. Her lingering attachment to the Holy Grail was solely due to her responsibility to the Einzbern Family.
Rin Tohsaka, that clingy girl, wanted to witness the Holy Grail most of all. But she had started out as Karn's enemy, not his ally.
After Karn explained the fundamental purpose of the Holy Grail War, they had a farewell meal at the Matou residence and truly went their separate ways.
Medea and Medusa returned to the Lesser Holy Grail. By then, it had gathered the souls of all fourteen Servants, and Karn had already used the Holy Grail to connect to Fuyuki City's underground ley lines.
He could summon the Greater Holy Grail at any time to punch a hole through the world.
Zero-Tails also benefited from the Lesser Holy Grail's complete collection of Servant souls. The energy of the world's evil overflowed endlessly, growing without limit. Karn merely kept his size under control; otherwise, he would already have been larger than the fully formed Ten-Tails.
Zero-Tails now served as a purifier for the Lesser Holy Grail. As long as