The Book of the Dead was a series of almost two hundred spells represented as texts, songs and pictures written on papyrus. They were individually customized for the dead. They were buried along with the dead to make their passage into the underworld easier. After working their way through lakes of fire, spitting cobras, demon jackals and giant bugs their soul is led into a hall of judgment in Duat by Anubis (god of mummification) and the deceased's heart, which was the record of the morality of the owner, is weighed against a single feather representing Ma'at (the concept of truth, and order). A heart that weighed less than the feather was considered a pure heart. This resulted in a good outcome. A heart heavy with guilt and sin from one's life weighed more than the feather, and so the heart would be eaten by Ammit ("Eater of Hearts")–part crocodile, part lion, and part hippopotamus. If the outcome was good, the dead are taken to Osiris, god of the afterlife, in Aaru, but the if the out come was bad, the demon Ammit destroyed their heart which killed the soul. The person would then be placed in a special place with food just out of reach of their hands. If they ever got the food, demons would put them into a hole to make it harder for them.