Goht

Goht is the second boss in The Legend of Zelda: Majora's Mask. He is a giant mechanical bull who is, at the beginning of the boss battle, frozen in a giant block of ice. Whip out your Fire Arrows and shoot one at him. He will come back to life and start running around the stadium-like room in an attempt to kill you. Put on your Goron Mask and start to roll around the stadium and hit Goht when you have spikes on your back. Conveniently enough there are Magic Jars around the room so if you need more magic, simply roll through a jar and continue rolling. When rolling around as Goron Link be careful as there are many rocks and bombs falling from the ceiling and a crazy lightning blast that you should try to avoid. When he's done, you'll see him crash into a wall and make a ton of rocks fall on top of him allowing you to claim your Heart Container and Goht's Remains.

You can also kill Goht using arrows. Simply stand in one place and fire a few arrows each time Goht charges past.