Avatar: Seven Havensis a far more mystery-driven series than its predecessors, The Legend of Korraand Avatar: The Last Airbender.Avatar Korra supposedly caused a cataclysm that destroyed most of the world, but it’s unclear why she would do that and how the new Avatar might be able to fix things. The first episode of Seven Havens premiered on Oct. 9, and the writers may have already provided some big hints about what’s going on.