Fyrus

Twilit Igniter Fyrus (覚醒火炎獣 マグドフレイモス) is the boss of the Goron Mines, the second dungeon in The Legend of Zelda: Twilight Princess. A gargantuan bipedal creature wreathed in flame, Fyrus' appearance may be based on the creature known as Balrog from J. R. R. Tolkien's Middle-earth universe. Interestingly, Fyrus is the only boss in Twilight Princess whose battle has only one phase.

Biography
Shortly before Link arrived at Death Mountain, a group of Gorons, lead by their tribe's patriarch, Darbus, ventured into their mines to investigate a recent influx of enemies. There, they came across one of the Fused Shadows, and its dark power corrupted Darbus' mind. He took on a strange new physical form and became violent, forcing the other Gorons to chain him up and lock him away deep in the mines.

When Link arrives at the entrance to the mines and bests one of the Goron elders, Gor Coron, in a sumo wrestling match, the Gorons recognize his strength and asks of him to enter the mine complex and free Darbus from his possession. Link successfully completes this task, and retrieves the second Fused Shadow for Midna. Despite their gratitude, the Goron elders were unwilling to inform Darbus, who was suffering from memory loss from his ordeal, that he had been saved by a mere Hylian, and thus he offered no thanks to Link until he learned the truth a while later. He repays his debt by using his superior strength to open the way to the Hidden Village, which had been blocked by chunks of rock.

Battle
When Link has assembled the boss key and enters the room where Fyrus is being held, the boss awakens his fiery powers and pulls free of his chains. He attacks Link by charging at him and whipping with his chains. Fyrus also summons a wall of fire. In order to defeat him, Link must to first shoot him in the head with the Hero's Bow, before running round the back of him and grabbing one of the chains on his feet. By wearing the Iron Boots and tugging on these chains, Link makes Fyrus topple over and fall to the ground, allowing him to damage Fyrus with his sword. After repeating this a few times, Darbus is freed from the Fused Shadow's vile influence.

Video
This clip was provided by lleeoo2010 at YouTube. 0A2nyZghpCI&feature=related

Etymology
The name "Fyrus" is likely a reference to the English word "fire" and the last syllable of the creature's alter ego, Darbus.