The Big Horn, also known as the Gigan Rhino, is a boss in Final Fantasy II that guards the mystical Black Mask on the Tropical Island. Firion and his party must defeat the Big Horn and obtain the Black Mask in order to gain access to the Ultima spell in the Mysidian Tower. The Big Horn can also be encountered in the path to Mysidia, where it can become a dangerous encounter for unprepared parties. They appear in packs of two to four.