Ep 11. The Fifth Contractor

Shirou and Saber have successfully thwarted Caster and her master's plans. However, with the Holy Grail War nearing its end and the final battle approaching, Shirou knows he needs to strengthen his abilities to protect himself and those he cares about. He begins to train with Archer, who shares a similar fighting style, to learn new techniques and strategies.

Meanwhile, Rin and Archer continue their investigation into the true identity of Caster's master, the mysterious "fifth contractor." Rin suspects that it could be a powerful magician from the Mage's Association, but the lack of concrete evidence makes it difficult to pinpoint the culprit. As they dig deeper, they discover that the fifth contractor may have a personal connection to Rin's family, adding a new layer of intrigue to the already complex war.

Elsewhere, Caster's defeated master returns to his workshop to work on a new project - a golem made of human corpses. His twisted experiments and obsession with magic make him a dangerous wildcard in the war, and it becomes clear that he will do anything to gain the upper hand.

As tensions rise and the war draws to a close, all the participants must make difficult choices and face the consequences of their actions. Will Shirou and his allies be able to emerge victorious in the final battle, or will the power of the Holy Grail be too much for them to handle? The Fifth Contractor sets the stage for an explosive finale to the thrilling first season of Fate/stay night [Unlimited Blade Works].