The Flame Cow King is monster with immense strength which befits one who is called the god of battle.  His strength was so immense that he could overwhelm most enemies easily without the use of a weapon.  Only when he encounters a worthy opponent, does he reveal the Fire Dragon Sword.  Weighing nearly 2400 pounds, there was no one who would wield this weapon.  This is also the only weapon that could match Sonogongs staff.