What type of Figurative language is this “The truth is, that he tried to keep down his terror, for the specter’s voice disturbed the very marrow of his bones.”
and what does it mean ???

This is a hyperbole, I believe.

Explanation:

Hyperbole provide a use of exaggeration to make a more impactful effect on it's readers. The quote itself means that the specter is unbelievably frightening to this person. In a bit more depth, stating that "the specter's voice disturbed the the very marrow of his bones" refers to how blood cells are produced. Without blood cells, you're body can't distribute oxygen, stating that this frightening creature was in complete control of him.

explanation:

gay