The 40K universe, like our own world, has a bevy of origin myths. Our world has legends like the creation of the world by Marduk in his clash against Tiamat the great dragon of chaos from Mesopotamian myth, the creation of the world from the body of a dead giant in Norse mythology, the creation of the world from a great sea when the sun rises as depicted in Egyptian mythology, as well as the commonly known Old Testament account from the Abrahamic religions. Many of these stories borrow from each other in many different ways as they have influenced each other across history, and many of their themes have made their way into the creation mythology of 40K