Not that. The spoiler is the explanation, the mechanics of how things works. With the advance knowledge that we have, the sense of discovery and exploration is reduced. This sense of wonder and discovery is a typical fare in Fantasy. This is the very charm in Alice in Wonderland. We meet all those wacky characters and Wonderland’s curious logic for a great read.
I was kinda waiting for book two to explore the nature of demon bodies, their anantomy so to speak.