Purpose

In the vast plaza, Leon used a brush to draw a circle of Rune, forming an enormous ring.

Black ink fell onto the pristine white tiles, standing out starkly.

Artoria looked around, then followed behind Leon with a puzzled expression. "Brother, are you drawing a magic circle?"

"What is it for, exactly?"

Holding the brush, Leon took a few steps inside the circle, checked the distances again, and lowered the brush once more.

"Don't ask yet. You'll disrupt my train of thought."

"You'll find out soon enough."

"Oh."

Such a perfunctory expl...