Well I'm on xbone . But I can tell you some tips for hard mode. The safest method is 3 rt or heavy hits per down and you'll beat him. When you get more comfortable to do 4 hits on him per down all you have to do is 4+4 4+1+1 slash. It should leave him right in between the cr in crota . After ogres 4 should do the trick. Pop a bubble when going back to the crystal room , that way boomers don't destroy you . Honestly the rest is up to you as you run sword . Just practice more man. Go lfg and say you have experience lol it'll work