At some point in the past a powerful wizard wished to have complete knowledge of the universe inside of a single tome. It took him many eons however eventually he got everything and put on a few enchantments. When it encounters a new species it tries to gather all the information about it and adds the information to itself. The first page anyone sees no matter what page is turned to is blank except for the scentence "think about what you want to know and then turn the page" then when the page is turned you get the information you wanted to see. Because of that enchantment the book actually appears to be a lot thinner than it was. It was about as thick as a 100 page book.
After awhile when the wizard took on an apprentice by the name of Elizabeth he gave her the book and told her to use it to help with her studies. Eventually however Elizabeth made a mistake and struck the book with her specialty transformation magic. The book drained all her magic power making her just a wise woman and gave the book some transformation powers. Now instead of just keeping all the information in the universe recorded now one could remove or add rules/information to the universe just by writing or erasing information from the book using your finger. To escape responsibility after figuring out what had happened she smudged out her master from the universe and gave herself the property of immortality. In some hope of redemption she gave the rest of her immortal life to helping out people gain information in a library. Now however she accidentally lent out the precious book. However who was it lent to?