if you're looking for a simple "stun champions" farm, find a spot that has an unstoppable in it, grab the appropriate weapon and mod on your character (i find a hc or scout works well). clear out all the adds, dip behind cover, load up the unstoppable aspect of the weapon, pop 'em in the dome and wait for his animation to end. rinse-n-repeat. knock it out in 10 minutes. also, good practice for the timing of their animation. happy hunting guardian