How did everyone else manage to do this achievement is it just luck ? 3 times already i am doing it very correctly, killing every add long before they can reach the boss and yet again today i didn't got it, and now in order to have that boss to spawn i will have to do the dungeon 4-7 more days, what i do is to spread the dps so everyone to take 1 group of adds and the tank takes the 4th while boss is at the center, so is there any trick that i am missing here ?
Uhm, mages, warlocks? Any class that has heavy AoE. I have this achievement on my chars, the only one I don't have right now is Hadronox Denies and it seems it's impossible to do because he webs the first gate no matter what...