it could be possbile if rings are allowed.(which i think they are) First you should bring some high lvl food, not a must, but the guy can hit pretty hard, and if you can't heal fast you will be dead fast. Second, bring about 4-5 rings of recoil, this way when he hits you, he will get hit back. This way if you can't do damage to him, atleast he can damage himself. (find out how much his first 3 forms hp is total, then divide that by 40 round the number up and bring that many rings.) and remember you only got to kill 3 forms, the 4th isn't necessary