Ep. 15: Shirō transfers magical circuits to Saber, enabling Ilya and Berserker to return for a final match.

15

To restore Saber's depleted mana reserves, Shirō transfers a portion of his magical circuits to her. This sacrifice permanently limits his own magical capabilities, preventing him from utilizing certain spells or competing with other magicians on equal footing. Following this significant transfer of power, Illyasviel von Einzbern and her servant Berserker return to confront Shirō and Saber. The group engages in a decisive final battle to determine the outcome of their conflict. This encounter serves as the culmination of their ongoing struggle, with the stakes heightened by Shirō's diminished magical potential and the renewed threat posed by his opponents.