With the champion system that Bungie has implemented, I can only see one logical progression of it. Over-stoppa-barrier anyone? Imagine double or triple modifiers on champions at once. Here is an example. Over-stoppa-barrier - you need to overload it to stop the health regen and the teleporting, you need to hit it with unstoppable to lock it down and it will also randomly throw up the barrier shield. This would require more fireteam coordination but now that the champion system has been out for awhile, people have learned how to combat them rather effectively. Maybe have double modifiers on lower nightfall content and triple modifiers on master/grandmaster/raids. What do you think? also....Overstoppabarrier wyverns sound awesome!!!