The Book of Shadows is the Charmed One's magical book. It contains spells, potions and information of various magical creatures such as demons and warlocks. The Book of Shadows has been around since beginning of the family line. The book has its own defensive power. Whenever evil tries to touch the book, it jumps away. Each generation has added to the Book of Shadows making it more and more powerful. For example, in the final episode, each of the sisters adds all that they have learned so that future generations of Halliwell witches can learn from their experiences.