Rael

Rael is a character from. He is a member of the Lokomo race and Guardian of the Sand Realm who resides in the Sand Sanctuary. Like the rest of the Lokomo people, Rael possesses a sacred instrument, his being the oboe, which generates energy to power the Spirit Tracks when played with another sacred instrument.

Biography
In order to access the chamber of the sanctuary in which Rael is located, Link must blast the area where the gazes of the big statues scattered throughout the realm meet. This opens an underground stairway leading to Rael's chamber who, after meeting Link, performs a Lokomo Song with his oboe along with Link and his Spirit Flute to restore the Spirit Tracks leading to the Sand Temple. Rael then tells Link of the three trials he must pass to reach the temple before the young hero and Princess Zelda depart to retrieve the Bow of Light from within the dungeon's depths.

During the final battle against Malladus, Princess Zelda sings a duet with Link, and soon after this, all five of the Lokomos, including Rael, join in to form a full orchestrated version of the piece. This melody weakens Malladus and reveals a weak spot in his back, which is necessary to defeat the Demon King once and for all. Rael is last seen during the ending credits when Anjean, along with the rest of the Lokomos, departs towards the heavens after the defeat of the Demon King since their protection is no longer needed in the land of Hyrule.

Force Gem
After Link completes the Sand Temple, Link can bring Rael five Cuccos from Hyrule Castle Town to help him with his Cucco research, which consists of harnessing the unbelievable power the Cuccos possess when they call others as they are being threatened by others and use this power for the good of mankind. As a sign of gratitude, Rael will give the young hero a Force Gem that reveals more tracks in the Fire Realm, opening way to the Ends of the Earth Station.

Trivia

 * Rael is a play on the word "Rails", a synonym for tracks. Similarly, his Japanese name, Tenda is a play on tender, another word for coal cars.