New problem - now that no one is farming during events unless they have domain shields the invaders take hours to refresh which has put a premium on uber invaders so if you start on an uber invader you wont get far before someone kills it with one attack. (There was a time when people didn't poach invaders another person was working on).

So now we need an invader shield to stop someone else poaching your uber invader. (Wont work if the uber invader shield costs the same as the energy needed to kill an uber in one hit).