Eldin (Dragon)

Eldin is one of the three guardian deities of The Surface in the Zelda series. Eldin is mainly featured in The Legend of Zelda: Skyward Sword as the game takes place in the period were the Dragons are tasked with protecting the land in the absence of Goddess Hylia. As his name suggest, Eldin watches over the Eldin Province.

History
Eldin was tasked with watching over the Eldin Province by the Goddess Hylia a long time before the events of Skyward Sword and was asked to teach one of the four parts of the "Song of the Hero" once said hero would appear in the distant future.

After defeating Bilocyte and freeing Levias, the guardian Deity of the sky, Link learn about the existence of the "Song of the Hero" and that he needs to ask the three dragons for their part of the song in order to reach the Triforce. While searching for these parts, Link travels to Eldin Volcano, where he is captured by Bokoblins and forced to regain all of his gear.

After retrieving all of his gear, Link can travel to the lair of Eldin where the dragon teaches him his part of the song. Once Link has assembled the song in its entirety, Eldin, along with Faron, Lanayru, and Levias himself, sing while he plays it inside the Thunderhead. After this, Link can go back to Eldin's lair to chat with the dragon and learn more about the region and the other Dragons.

Fi's Comment
"That is Eldin, the Fire Dragon. As the great protector of Eldin Province, he has power over fire."