Long, long ago, the Egyptians created a kind of magical technology to prevent their souls being bound to their bodies. They called it 'mummification'. The worshippers of Aten, forever looking to pervert the traditional way of doing things, created 'anti-mummies'. Their bodies were converted into terrible magnets for the spirits of death, drains into the dark spirit world. The Aten Mummies are filled with former cultists' spirits, funnelled from their afterlives into the heavily treated corpses of their former lives.