Volvagia

A legendary monster in Goron lore, Volvagia is the boss residing in the Fire Temple. The fierce, snake like dragon can only be killed with the legendary Megaton Hammer. Some claim that it actually is a Leviathan, since it doesn't have wings, and glides through the air.

Volvagia had hot dragon sex with a Dodongo, and their offspring was Valoo, the gaurdian of the Rito. Both dragons resided at the same location. (Dragon Roost Island, where Valoo lives, and Death Mountain, where Volvagia lives, are considered to be the same thing.)