The white powder gathered in his hand took shape. As before, it was the shape of a guillotine. It was a board-shaped blade that looked like a seventy centimeter square that had had its bottom cut diagonally. The man held it by the ring that would normally have the supporting rope tied to it.

[...]

“Does that weapon function using the flesh of God...?” “Oh, so even an Asian can figure that out.” Itsuwa was nearly speechless as Terra attempted to provoke Itsuwa. “During mass, wine is treated as the blood of God and the bread is treated as the flesh of God. And I’m sure I don’t have to tell you that the event of mass is modeled after the execution of the Son of God on the cross.” Itsuwa bit her lip upon Terra’s words. Kamijou had no way of knowing, but those words were quite destructive to someone knowledgeable in magic.

Toaru Majutsu no Index Volume 14, pg 117, 124