Fate/Stay Night: Unlimited Blade Works

Princess of Colchis (1x14)

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At his home, Shirō tells Rin that he plans on continuing to fight in the Holy Grail War, even without the use of a Servant. She replies that she has no choice but to let him before reaffirming their partnership. While discussing a strategy to defeat Caster and rescue Saber, the two decide to team up with Illyasviel, since Archer had told Rin that Berserker is in fact the ancient Greek hero Heracles, which might give them an advantage against Caster. Meanwhile, Caster recounts the time she was summoned by another magus for the Holy Grail War, only to be unsatisfied by his inefficient method of acquiring mana for her. After Caster requested to create mana herself, the magus realized he could not trust a magic user better than himself. As a result, he contacted Kirei and asked for another Servant, but Kirei told him to dispatch Caster first before making another Master-Servant pact. The magus then sent out a contract to Lancer's Master, a colleague, for Caster's death. In the meantime, she destroyed the magus's workshop, and then killed him when he returned and tried to use his Command Seals to force her into committing suicide. She was then gravely injured by Lancer and barely escaped with her life, but she was saved by Kuzuki, who became her new Master. In the present day, Illyasviel observes Shirō and Rin traveling to her villa, then sends out her maids to retrieve them. However, the villa is breached by Shinji and his new Servant, who reveals his knowledge that the Holy Grail's vessel is being held inside Illyasviel. When the maids retaliate in an effort to protect Illyasviel, the Servant kills them with a Noble Phantasm that summons numerous swords and fires them. He is then confronted by Illyasviel, who orders Berserker to attack him.