This was a very fun quest a hack n slash with a good boss at the end. I was able to do this quest with my Wood Elf Archer at LvL 2. The tools : Marksman at LvL 54 used about 125 arrows ( Iron) (which you can collect as many as you can carry from defeating all the skeletons around the Island) The tactics are to firsly run for cover to the left pillar and using a a sparksword ( iron longsword with 1-4 shock damage) and a shield, Kill off the skeletons as quickly as possible, draw Grurn out and use the pillar as cover for his magical attacks, as soon as one hits the pilar move out and hit with an arrow- rinse repeat until dead. He will move from side to side trying to get to use just use the pillar to put him into the protected position and keep pelting him with arrows. This will take some time and maybe a few re-loads if you move from cover at the wrong point but this is the easiest way I've found to kill him.
