Book of Darkness

The Book of Darkness is an alien magical artifact from the anime Mahou Shoujo Lyrical Nanoha. Originally a sort of massive self-filling book of magic and technologies, at some point in the past, a mage meddled with the books "Defense System", accidentally turning it into an parasitic device that feeds of the user's magic and lifeforce, eventually killing them if they could not provide it with magic and lifeforce. Once it has collected enough magic, filling all 666 pages, it could supposed grant a wish, but could actually only be used for destruction. The Book found its way into to the hands of a girl named Hayate Yagami, leaching her health and confining her to a wheelchair, until it attempted to put her into an enchanted sleep and take over her body, however, Hayate reprogrammed the to book, and used it as her magical device, giving her great magical powers.