Already two times before my eyes the book disappeared. Once from the chest (I even had time to look at it with a lens), the second time from the boss. I can not say what exactly it caused. Either a blow to book, or the killing of another mob in the place of book drop. It’s very frustrating. =/
Another thing i dont like. Suddenly, the skill ww disappeared. If this is intended, then it turns out I should carry 5 books with me, so that I can not be left without the required skill in dangerous situation.
Books can break. Ok this is system. Then there must be more info on books, how much uses its have. like 2/15 to break. And maybe repair it with blank list or upgrade book with another books.