However, one of the six marks—the one closest to his left breast— had turned dark. “She crushed my concept-nucleus with such ease! I was as careful as I could be! And it didn’t even matter! With her arm, she could return even a being far stronger than me to naught!” Jester touched the darkened mark with a finger, whereupon his fingertip was sucked into the  skin of his chest. Strangely, not a drop of blood fell from the mark. He shoved his hand up to the  wrist into the muddy flesh-colored morass and squelched at his own innards. “My mage-soul has been utterly destroyed.”
Then, like a gear, or indeed, like a revolver, the six marks rotated, almost as though they were wriggling. The darkened mark shifted to his left flank, loading a new red mark on his left breast. “In that case, I had best put on a new face from here on out.”
And then, somehow—just as those six marks had moved, his body and face pulsated. A moment later, he had the appearance of an entirely different man.

Fate/Strange Fake: Volume 1, Part 3 ("Assassin")