New Bookshelve use with new books

The new bookshelves are also to be found in Endcities, Woodland Mansions etc.. Among normal books, "mystical books" can be found in them: To see the content of the books (e.g. enchantments, exploration maps hidden in them, etc.), you have to hold the book in your hand and right-click. However, on some of these books there is a curse with negative effects that cannot be removed by milk.