Did Qarn tonight with some friends, we got a tank, he left before we even started fighting the first mob. We decided to try and let my fairy tank. (We're experienced in Qarn so we weren't worried much) It tanked all the mobs including the first boss! LOL
We just let it build hate by having it spam heal embrace on herself, she managed to hold all the mobs aggro until one got down to 20% and went after a DPS.
For the first boss, we let it sit and heal for about a minute, then went in. She managed to hold aggro extremely well. She only lost it once when I had to move her onto a glowing platform to remove Doom, but soon regained the aggro. I just kept Sustain up on her the entire time and would occasionally toss an Adlo when the bees came, but other than that she kept herself alive well just by spamming, which in turn kept the boss aggro'd on her.
Unfortunately a tank came after we finished the first boss. I would've liked to see how well she would do on the other bosses, lol.
Sad thing is, she held aggro better than the tank that came. u-u
(We tried Selene on one of the random mobs to see how well she would do, but she died. No regen=death apparently, lol)