"We're lucky to have this book. In my research, I discovered that the author, Clovis from Tour, was a Dark Wizard who lived in the 9th century. According to his contemporaries, he never actually created the wands he wrote about. Before he turned forty, he was attacked by other Wizards or wizarding families whose wand secrets he had stolen. After Clovis’s death, the few remaining copies of the book were burned, leaving this as the only copy. There is no record of it after the year 1000. This is probably why the Dark Lord never sought it out. Even if he did know of its existence, he probably believed it to be unobtainable."