Check out the Shabaka stone. While almost 600 years after Akhenaten, it was erected by a black Nubian pharaoh who was trying to return Egypt to its original religion. The stone claims to reproduce text from the first dynasty of Egypt! It focuses on the god Ptah, who is the god of design, craft and creativity — and the creator of the universe. It has some pretty esoteric sections and perhaps even foreshadows the rise of Hermetic philosophy in late antiquity Egypt.