Can I just add another thing here... If you don't kill the Risen near and in the towers they can get trapped when the tower falls on top of them; then you cannot kill them because you cannot see them to target them. My Guardian managed to get a target but could not kill because the Risen was on a different 'level' to me so healed as fast as I could damage it :(Devs: Is there any way you can get the Risen to run out of the tower when it comes down?