Don't get me wrong, this is certainly one of the hardest quests in the whole game ...but I still beat it almost every time. I think I only died once. Your build obviously sucks and/or you're not using your resources. Put up your Quen shield and use some healing potions/decoctions/bombs.
Oh build definitely wasn’t the best but as I answered to other comments it was my first playthrough and I had no idea what to expect and Quen if I remember correctly was taking only one hit cause I wasn’t speced into it and didn’t have decoctions and pots made making it harder for myself 😁
