Kill the Saint Physique, Capture Red-Hair, Eat Dog Meat

To this world, souls were utterly immortal.

As long as the blueprint of their memories existed in the Astral Netherworld, a dimension separate from the Material World, souls would never die.

"The Third Magic."

One of this world's Five Great Magics, it granted true eternal youth and immortality. It drew limitless energy from the soul to achieve Perpetual Motion, then used that immortal soul as a template to create a perfect body to match.

The so-called Holy Grail War was a ritual meant to achieve the Third Magic. The Holy Grail's ability to grant wishes was merely a by-product of that ritual.

Behind Ryuudou Temple, in the cold, damp Great Hollow underground.

Shirou Emiya entered and looked toward Caster, who wore a hooded cloak of indigo and violet over a purple robe. "Well, Caster? Any progress?"

"Given the information you provided, along with those powers, there's a good chance I can purify the Holy Grail." Caster turned, her long blue hair swaying. A trace of wariness remained in her eyes.

After witnessing the battle between Gilgamesh and Shirou Emiya above Fuyuki, she had lost all thought of resisting when Shirou Emiya arrived at Ryuudou Temple with Saber and that monster Heracles. All she wanted was for him to spare her Master, Kuzuki Souichirou.

But to her surprise, he had proposed a partnership. As if he already knew the future, he promised she could gain a body through the Holy Grail and that he would not attack her or Kuzuki Souichirou.

"How much time?" Shirou Emiya nodded. "Roughly how long will it take?"

"The Ley Line has ample magical energy, and I can also use the energy on the Holy Grail's outer shell." After a moment's thought, Caster gave her answer. "Three days at the earliest."

"That's fine. There's no need