It was Shirou Emiya's holy light, dragged along by Anno's holy light as they blasted together toward the Black Tower.
Because of the holy light, Shirou Emiya even had to use one Command Spell to replenish both his and Anno's mana, ensuring they could unleash as much magical output as possible while keeping his magic circuits from being easily drained dry.
Though for various reasons, Shirou Emiya's magic circuits had rapidly developed into what a qualified magus should possess, they had never been properly developed or trained. In this battle, he was basically relying entirely on his status as a Demi-Servant to hold things together.
The fact that those two things could coexist was rather bizarre in its own way.
But there was no second Demi-Servant here, so there was no way to make a comparison even if they wanted to.
Boom—
BOOM BOOM BOOM BOOM BOOM—!!!
Holy light roared against the base of the Black Tower, only to be split in two by it. The sounds emitted by the Black Tower grew ever more agonized.
Its tower body moved in a grotesque fashion, as though it possessed flesh, turning every hole that glowed red toward the holy light roaring below.
Boom—!!!
Black light collided with the holy light of Anno and Shirou Emiya, but—
It was useless.
Anno and Shirou Emiya stood side by side, the colors of the light reflected in their eyes.
The projected Holy Swords had already vanished because they could not keep up with the radiance unleashed by true Noble Phantasms, but their light still mingled with the holy light, ravaging everything within the Black Tower.
"Xiang An—!"
Lightning crackled around Sakumura's blade as he laughed and shouted toward Xiang An, who was riding a divine steed through the sky in the distance.
Xiang An