Answer

Shirō and Emiya continue their battle, with Emiya chastising Shirō for continuing to pursue his ideal and declaring that he will remove every trace of him in existence. However, as the battle continues, Emiya begins to realize that Shirō, being himself, will never give up and that it is pointless to defeat him now. Finally, as he explains the beauty he saw in his ideal, Shirō's spirit begins to overwhelm Unlimited Blade Works, and he rushes Emiya. Emiya tries to react, but he becomes distracted by a flashback of Kiritsugu's last moments and is wounded by Shirō, just as Rin arrives. With this, Emiya admits defeat and allows Shirō, Rin, and Saber to escape, before being impaled by three swords fired from Gilgamesh's Noble Phantasm. Declaring his hatred for fakes, Gilgamesh fires more swords at Shirō and Emiya, but Emiya pushes Shirō out of the way and dies after taking the full blow of the attack. Saber, expressing a familiarity with Gilgamesh, demands to know why he is here, and he explains that after the end of the Fourth Holy Grail War, in which he was an Archer-class Servant, he bathed in the Holy Grail during its destruction at the hands of Saber, also a Servant in that war, and took physical form. He then explains the Holy Grail's true function as a container for thousands of curses, before announcing his intention to take it for himself and use it as a weapon to eradicate the human race, being disgusted by the lifestyle of modern humans and hoping to rule over any potential survivors. He then leaves the villa and later finds Shinji in the forest, learning from him about Kirei's death and the reason behind Rin's escape. When Shinji asks about finding a vessel for the Holy Grail, Gilgamesh implants Illyasviel's heart into him, deeming him a worthy vessel, and leaves him as he begins to mutate into a massive, shapeless form of flesh.