The Boss for the quest is much harder than his combat level. Don't underestimate him. It took me 3 attempts at level 90-something. He can use cranes and carts to injure you if I remember correctly, and he teleports around. It really helped me to bring energy potions to help you run around and hit him (I did the quest before summoning, if you have a terrorbird, Level 52 Summoning, that would greatly help!). Good luck, you can do it!