I tried it a few times on my Thief now and even with the overpowered Shortbow it seems impossible. Even cheap tactics like running away regenerating didn’t quite work as it takes so awefully long I always make a slight mistake then die.
This is a mayor issue in my oppinion as no one should have to resort to exploits(leaving the area to reset the fight) but at the moment it seems to be the only viable option.
I hope they fix this mission soon as this is not a challenge, it’s simply bad design. I wonder how a mayor plot mission can end up like this …