You need resist pots for sure, use some arrows not a lot, melee is going to be a great friend and learn what his movements are to indicate attacks, and kite do lots of kiting, the kill took me 30 minutes because I was doing it as carefully as I could, not to mention I had issues with oil enemies, and the goblins when doing it so just be careful and take your time dont rush the fight.. Also dont just make resist pots, make sure you have a lot of HP pots, and Stamina as well incase something goes south and you need to heal up or move quickly.