In the World of Darkness, the Spell of Life is powerful ritual which provides immortality. The ritual was initially developed by Isis, an Egyptian nature goddess, and Osiris sister and wife. The ritual to become immortal follows the cycle of nature in the sense, that all Immortals must die before they become Undying, and not until they have died can they become Undying. While the Spell of Life was able to sustain a body for millennia, it was flawed in that the recipient became a half-dead creature, resembling a walking corpse.
Only after Osiris awoke, he was able to create a new Spell of Life which did not contain the flaws of the previous one. This new version of the ritual was finally able to fill the recipients with life force and vitality, thus creating the Amenti. Those who denied this new version of the Spell were declared Shuankhsen, and are hunted by the Hand of Thoth. The Bane Mummies are the original and primary of the Hand of Thoth, as decreed by Horus, even though other enemies of Horus are persecuted with zeal by the Hand as well.
- Spell of Life (White Wolf Wikia)