In response to the criticism that the books promote Wicca, a number of Wiccans and other commenters have argued that the critics' definition of Wicca tends to lump together many and various spiritualist practices that actually have little in common. They have also highlighted the differences between magic within Wicca, which is invocational and derives from the divine powers, and that depicted by the "Harry Potter" books, which is a purely mechanical application of spells without invoking any deities. A Wiccan review of "Harry Potter: Witchcraft Repackaged" pointed out that "communing with the dead and spirit world, sorcery, curses, occult symbology, black magic demon possession"—all cited by the book as evidence of "Harry Potter" promoting Wicca—are not part of Wiccan belief.