text: Fate The first of the three heroines, Saber is a mighty warrior who keeps her identity secret, hence her substitute name after her role as a member of the Saber class. She also serves as the route's servant protagonist. She was the victor of the Fourth Holy Grail War with another Master and claimed to be the strongest out of all Servants in the Saber Class. However, Shirou is against Saber's constant aim for conflicts with other servants and instead seeks to ally with Rin. Shirou drops his pacifism when he discovers that his former friend, Shinji Matou, is a Master with the Servant Rider, aiming to sacrifice all students from their school to increase Rider's powers.
  Following Shinji and Rider's defeat, Shirou learns that Saber cannot fight at full strength without exchanging Mana (magical energy) with her Master. During a confrontation with Master Illya and her Servant Berserker, Shirou passes Saber his Mana and later assists her in defeating the enemy by projecting one of Arturia's swords in combat. As Shirou seeks to keep Saber in their world, he learns from the priest Kirei Kotomine that the Holy Grail is cursed. It is revealed that Shirou's late guardian, Kiritsugu, once used Saber to destroy the Grail. However, it instead caused the fire where Shirou lost his family.