Aeon418
Just to add to the above. I don't see how you can compare the magical diary to the Wiccan Book of Shadows. The magical diary is a record of an individual magicians experiences.
The Book of Shadows is a pre-existing collection of material that must be copied by hand to make a new Book of Shadows. But this only occurs within a Wiccan coven.
The Book of Shadows is a pre-existing collection of material that must be copied by hand to make a new Book of Shadows. But this only occurs within a Wiccan coven.