Pfortenbuch
During the First Intermediate Period (c. 2181–2055 BC), the Pyramid Texts developed into the Coffin Texts, which contain similar material and were available to non-royals. Succeeding funerary texts, like the "Book of the Dead" in the New Kingdom and the "Books of Breathing" from the Late Period (664–323 BC) and after, developed out of these earlier collections. The New Kingdom also saw the development of another type of funerary text, containing detailed and cohesive descriptions of the nocturnal journey of the sun god. Texts of this type include the "Amduat", the "Book of Gates", and the "Book of Caverns".