“It” did exist.
A messenger of death that had slipped into the heart of the gargantuan magecraft workshop whose wards and defense mechanisms, while not supreme, were only a step below it, without triggering even one of its systems.
“You have nothing to fear”
It was a strange voice. It seemed to come from the entire room, and yet it was only audible to Galvarosso. Its words were simple, but because they were simple, they swiftly resonated with his chaotic emotions.
“. . . Are you sure? A man like me . . .”
Tears flowed from his Mystic Eyes, which no longer showed him anything. Darkness mercifully enveloped his life.
“I have no reason to judge thee, nor do thou. Entrust all to the night.”
The darkness, which had taken human shape before he knew it, laid its hand on the man’s head as it dispassionately intoned:
“Awake in peace on the far side of sleep.”
Then, unnoticed, the darkness vanished from the room, leaving behind only an old man who no longer needed to breathe, his eyes closed and a hint of relief on his face.
He had yearned for magecraft.
Some might say that, for a man who had moved behind the scenes of mage and American society for so long for such a childish reason, his end had been too peaceful.

Fate/Strange Fake: Volume 5, Chapter 16 ("Breaking Dawn & Wakeless Dreams I")