This book stores the name of every student at Hogwarts.
If you fail to make the required three posts per week, your name will begin to disappear from the Book of Names. Over the course of five weeks, your name will progressively grow lighter and lighter until our crew will be completely unable to distinguish it as a name of magic altogether. However, if you post at least three times the following week, your name will begin to reappear stronger and stronger. But please keep in mind, if your name does disappear from the book we will have to send you back into the muggle world, and we don't want that.
