 Unlike the loose collections of spells, these netherworld books are structured depictions of Ra's passage through the Duat, and by analogy, the journey of the deceased person's soul through the realm of the dead.They were originally restricted to pharaonic tombs, but in the Third Intermediate Period they came to be used more widely.Temples existed from the beginning of Egyptian history, and at the height of the civilization they were present in most of its towns.