In the first part (where there is lava for a field), keep a steady pace while jumping around on the stones. Hold Forward and the direction that you want to jump and collect the shuriken. Throw it at him without locking on. After throwing the full amount of eight shuriken three or four times, he will fall down into the lava. Then, he will jump up and absorb the lava. You will now have to sword fight him. The Soul Sword and Revive Rage are recommended for this. If you run at him and slash repeatedly, you are going to get hammered. The best times to attack him are when he just finishes a quick slash and when he is just about to do the non-shock wave ground pound. ,Hit him at those times and use Berserks and Insane Rages every time you do not need to revive.