
I will try other Vicious dungeons in the next days, I was trying Namtar just now and it's really hard. But actually I realised that I never succeeded Namtar so I don't event know what the level looks like after the 2nd form of Namtar

I also tried a couple of times Gaan. Not much you can do except if you get the AA at lvl 8 or 9, and even then...
Dragon Isles was not too hard because no boss had physical resists. As soon as a boss has like 50%, it kind of reduce your life steal by half as well. That's what could make a Vampire run a failure.