I feel like there are multiple levels of terrifying to this book.

I can't get The Judge out of my head, he has a supernatural quality to him but in a horrible, intelligent way that makes him horrifying.

But then the other terrifying thing is just the depiction of the normal characters and what they go through and the actions they commit.

And then finally another level is the depiction of everything else they face. That scene where the boy first witnesses an attack by the Comanche is blood curdling and yet mesmerising within one sentence. For anybody looking for context, search for 'Blood Meridian Legion of horribles quote' for the whole sentence.