A master scroll book is an item obtainable from any level Treasure Trail. It can store every type of teleport scroll. Up to 1,000 of each type can be kept in the book.
While scrolls are stored in the book, one kind can be set as a default option. This becomes the left-click option of the book.
Upon death, the scrolls are removed from the book and dropped along with the empty book.1
, To receive a master scroll book, in a clue scroll, if you roll a teleport scroll you have a 1/23 chance to get a book.