The slash, wrapped in "Anti-World," surged toward the vampires while devouring all creation in its path—
Shirou had used the Vortex Sword once before, during the Fourth Holy Grail War.
At the time, he had obtained the power of his prime through Lady Avalon's "Dead Count Shapeshifter," and completed the analysis and replication of that Divine Construct in the Inner Sea of the Planet within the "Fae Domain: Unlimited Blade Works."
Originally, even if Shirou projected this sword, he lacked the Divine Factor needed to wield it.
The result of forcing its use was that the time limit of the "Dead Count Shapeshifter," which should have been more than sufficient, was instantly exhausted, while his own stamina and magical energy were also drained.
Fortunately, King of Heroes Gilgamesh had been in an extremely weakened state at the time, allowing Shirou to kill him successfully.
But what about this time?
Shirou was only sixteen now. His body was still far from its prime, and the magical energy within him was merely being supplied by Justiça rather than existing in a complete state.
But it was enough.
Before Shirou's magical energy ran out, Nero Chaos's "Principle (Primal Soil)" would be evaporated by the Vortex Sword—
"..."
Cracks appeared across Shirou's field of vision.
More precisely, the Mage's Eye Killer he wore had cracked—
Immediately afterward, an extremely intense sensation of falling surged over him.
"Your mind has finally revealed an opening, Lord Shirou."
In his daze, he saw a woman's enchanting smile.
Beautiful yet cruel, like a thorny flower, her seductive smile seemed to paint the entire world in blood.
"You actually left me aside and ignored me, ranking my threat below Nero Chaos...
"Even a refined lady called the 'Rose Princess' will get angry when she has reason to, you know?"