The Helmaroc King attacks using forceful winds to drive you into spikes on the sides, and by using a very powerful peck. However, when he misses his peck, his beak is stuck in the ground for some time. At this moment, you can the Skull Hammer to smash his mask. After smashing it four times, it breaks.His head is now vulnerable to the Master Sword as well as the Skull Hammer and arrows. Even the Boomerang and the Grappling Hook are capable of damaging him.