If you stand directly in this location https://i.imgur.com/svMkr0q.jpg you take 0 dmg from all of the elite special special GROUND abilities.
This is especially useful for all knilmasters abilities if you are mele or ranged to stand there and take no dmg and not have to move out of the 1 shot ability that is cast every 1-2 seconds. You will take no damage from this ability but you will still take auto attack dmg which is very very low.
This does not work for fire cleave from berserkers because it is not a ground dmg ability but the fire cleave is also not a 1 shot ability.
This worked for me for the fire storm (which is actually cast from above but it seems like the dmg is a ground dmg effect) from the chanters but the summoned mob will still mele you hard unless you stun it while it's being cast and then you dont have to worry about the summoned mob anyway.