This well-made tome is thin and small in size, able to fit in your coat pocket. The books is durable, waterproof, bound with wyvern hide and locked. Speaking the command word unlocks the book and speaking it again relocks it. This unique item is a prize stolen from the personal library of the Zulkir Szass Tam, the undead ruler of Thay. While unsuitable for spells it is the perfect item for anyone who likes to keep notes. No matter how many pages you fill with notes, more appear without ever adding to the volume's weight or thickness. The book also will magically open to whichever page or topic you wish to see.