I am level 45, my weapon is a Large Club +5, and Fall Control and magic shield. That stupid attack keeps killing me no matter what, I'M TRYING TO KILL IT. I can beat that boss if he didn't have that annoying attack!
I do that, but then when about a fourth of his health is gone, he always does it twice which doesn't give me enough time to heal and I die. And yes, the only attacks he does to me is that butt slam and downwards plunge. That club can do 208 damage max