by aokarasu
La Pucelle: The Crimson Saint ( 紅蓮の聖女ラ・ピュセル) is the suicide-type Noble Phantasm used by Jeanne d'Arc. It is a crystallized Conceptual Weapon that acts as an offensive interpretation of her burning at the stake, a subtype of Reality Marble that has the imagined landscape crystallized as a holy sword. The sword itself is the Heroic Spirit Joan of Arc. It uses the Sword of St. Catherine, which Ruler never swung once in her lifetime, as its catalyst, and manifests the flames which once burned her to death by saying "O' Lord, I entrust this body to you—", a line from a death poem, as an activation incantation.
from TYPE-MOON wiki
https://typemoon.fandom.com/wiki/La_Pucelle