These mobs aggro magic as well. Cast sneak on a friend, a few seconds later, I'm dead and I have a mnk running for dear life toward Dvucca portal. Thought maybe I'd lost sneak first or they aggro'd sight... Then a whm friend comes to raise me, then dies after casting Tractor.
>.> Would've been helpful knowledge ahead of time. Wish I'd known.
These guys have a weakness to Weaponskills in general. Myself and a Dark Knight were able to pull out some sick numbers and even a 5000+ damage Darkness to one of these.
So to repeat, they seem to take extra damage on weaponskills and skillchains (critical hits as well, perhaps).
The catch to this is that they have a lot of HP to shed.