they are a serious problem in netracels when there are 3 or four leach eximus units constantly giving them full health. the unit should just be removed IMO because it it just not fun to fight. at the very least have a timer on how long they will stay up and force a cooldown of at least five minutes once they despawn or are killed nothing like an enemy that ignores 70% of the games combat mechanics that you have to work your butt off to kill just for another to be spawned 3 seconds later.