“...Don’t turn around.”
Faldeus could just tell that the voice was male. It was so coldly inhuman, however, that he could not imagine the speaker’s age, build, or anything else except that he had whispered from behind Faldeus’ back.
“...!”
In that instant, Faldeus was prepared for his own death. Nothing he did now would do him any good. Even if he used all the magecraft he possessed, it would be impossible to extricate himself from this situation. The “death” he sensed was that certain.
Faldeus did not know what was behind him. It almost seemed to him that limitless blackness gaped open there. He sensed nothing. The voice had not even been full of bloodlust; almost the opposite...

Fate/Strange Fake: Volume 2, Chapter 5 ("Day 1, Dawn")