Volvagia

Volvagia, the Subterranean Lava Dragon, is the boss of the Fire Temple in Ocarina of Time.

In-game
Volvagia is encountered at the end of the Fire Temple, on a large octagonal platform surrounded by lava and covered in holes. Volvagia itself flies out of one of the holes and back in through another, initiating the Whac-a-Mole-esque fight. There are nine holes in total covering the platform, and Volvagia sticks its head out of them at random, at which point Link must smash its head with the Megaton Hammer. It will either stick its head out and swing its fiery hair to cause damage to Link, fly out completely, spitting fire at him, or fly up to the ceiling to dislodge flaming rocks to fall on Link, which can be avoided by climbing down the side of the battlefield. When only his head sticks out, Link can smash it with the Megaton Hammer, then again with the hammer or with the Master Sword when stunned. Eventually, it will leave the fiery pits and attack Link by flying through the air, spitting fire or making rocks fall. While the rocks are falling, Link can still hang on the side of the platform, or shoot arrows at Volvagia, which can bring down its health, but not defeat it entirely. Once Volvagia has been hit with the Master Sword six times after being stunned, it dies, its skin burning off of its skeleton. It drops a Heart Container, and Link receives the Fire Medallion for his efforts.