Obviously this can be hard, if you are playing online. I am playing offline and this was the only boss I beat on my first try. I had Havel's set and Black Knight Sword. It didn't do that much damage and I could just run at him before he landed the blow. I killed the helpers by hiding behind the pillar. I actually was wondering what kind of boss this will be after I kill it for the first time, but it actually just died. Although I think it's just a stage before Gael.