Achilles knew Jeanne's true identity.
Before this decisive battle had begun, Amakusa Shirou Tokisada had already revealed to everyone the information he had obtained through Revelation, True Name Discernment, and years of collection.
"The Ruler of this Holy Grail War is Saint Joan of Arc."
Amakusa Shirou Tokisada had told everyone this information.
Thus, Achilles knew Jeanne's true name.
Yet precisely because he knew, Achilles found it inconceivable.
"How could a mere Saintess hurt me?"
Though Saint Joan of Arc's legend did include some connection to god and angels, the Saintess herself had no connection to god whatsoever.
She had been born into an ordinary farming family.
Her race was ordinary humanity.
The place she had stood was an ordinary battlefield.
The weapon she had used was an ordinary mortal weapon.
In other words, Jeanne could neither possess Divinity nor possibly wield a Treasure Tool capable of slaying god. Even if she was the world's most famous Saintess and, as a Ruler, enjoyed all manner of privileges that allowed her to rank among the foremost Servants, she absolutely should not have been able to harm Achilles, who possessed an Immortal Body.
Yet Achilles had been wounded by Jeanne's attack.
That reminded Achilles of Karna's situation.
"Come to think of it, Lancer was clearly an immortal hero too, yet he was wounded when he fought Ruler last time."
That meant Jeanne possessed a means of ignoring both of their defenses and inflicting damage upon them.
That thought was not wrong.
Strictly speaking, Achilles' Immortal Body was a constitution, a Treasure Tool. Yet the Goddess's Heart equipped by Sylvia could ignore such defenses and directly inflict full damage.
Achilles' Immortal Body was useless before Jeanne.
"Haah—!"
The Holy Banner swept through the Explosive Flame, parting the surrounding waves of fire and revealing