The main point of the map is there are two sides, heaven and hell, the evil people are trying to get to heaven and destroy it and the good people are trying to stop them, if a evil person dies then he becomes a good person and if a good person dies he becomes a evil person. The good people win if the defeat all the dark people and make them all good and the dark people win if the destroy heaven.
but the thing is you are a hero so you can gain lvls and you stay the lvl when you changes sides, its kinda like hero arena but you dont stay on the same side so the teams stay even prity much