Most of our modern end of the world literature is set in the future, but the Babylonians, in the midst of a dark age, set their end of the world literature right in their own times, since for them it may have seemed like the world itself was ending. Erra, also called Nergal, wants to destroy a bunch of stuff because that is his nature. He tries protecting the universe, but gets frustrated with that, so he destroys the universe instead. Interestingly, this story may have become extremely popular in Babylonia because it predicted that Babylon would rise again, and in due course of the centuries is sure enough did, in fashion similar to that predicted in the text.