Emily C.a. Snyder said this quote

But neither could compare with the gargantuan natural edifice that was the mountain upon which Nachtstürm Castle rose. It was a mountain made of the darkness between two lightning bolts. It was made less of earth than Stygian frost. Whole towns fell away as they ascended, as though the ranks of black and frowning conifers waged war against the humans below. Even the path – rather narrow and rarely straight – seemed less made by centuries of pilgrim feet and more by the trace of some careless demon’s claw.It was, in fact, perfect.