Here is what I noticed from our attempt on Hrungnir last night. The 50K aoe damage skill is rough, but it can be managed with a good strategy. The 50K aoe heal makes him difficult, but with enough dps you can break through it. It is the frequency that he casts the heal spell that makes him impossible. If he cast his Fetid Feast skill just a little bit less, Hrungnir would be no problem.
You guys do know that you are brainstorming on a mob that's obviously not in its final form and was intentionally made OP so no one can kill him, right?
They tried to do the same to a post-beta 3 Aggy, although they underestimated player's abilities, and clans killed Aggy before he was itemzied, so they took him out for weeks until he was put back with a weaker (and final at the time) version.
There are two types of people in this world: Those who crave closure
A business is more profitable if they don't gouge and piss off customers.