"I left it in the library. Since I don't know how long it will take to finish it, I didn't feel like removing it." Xue Yang isn't sure if anyone else would have an interest in it but he also didn't want it to be common knowledge that he might be studying. Not that it matters. Xue Yang is actually used to absorbing whatever he can in books involving the dark arts in order to weave it into something he can use.

"Even if the books don't outwardly describe what a monster's weak point is, it can be determined with a solid knowledge of their physical make up."