“Asura” is a realm where huge beings / titans lives. They are again invisible to normal human eyes and Dhamma says most of them lives based on sea surfaces, mountains, rocks etc. They have to suffer unlimitedly with their heavy & huge bodies. Here onward, let's discuss more about them!
Most of the evil deed they done is that ignoring the work they have to do as their responsibilities as a human being. When we discuss further about the categories of Asura / demons / titans you can get more understanding about this realm.