Thunderhead

The Thunderhead is a location in The Sky in Skyward Sword. It is a giant, billowing storm cloud in The Sky near Skyloft. Around the outside of Thunderhead, tornadoes are common. On the inside of Thunderhead, plenty of lightning flashes occur, though they eventually stop once the parasite Bilocyte is defeated. The Sky Spirit, Levias, inhabits the area, watching over the Sky. The Thunderhead houses the Isle of Songs, Bug Rock, and several other islands, some of which contain Goddess Chests.

Once the mirror is activated on top of the Light Tower, reflects a beam of green energy that parts the clouds covering the entrance. This allows Link to access the Thunderhead, which becomes necessary in his quest, as the Thunderhead houses the Isle of Songs, which allows Link to learn the songs "Farore's Courage", "Nayru's Wisdom" and "Din's Power". The Sky Spirt Levias, the forth dragon, who knows the fourth part of the Song of the Hero, resides in the Thunderhead. He becomes infected by the parasite Bilocyte, who Link must defeat. All of the songs in Skyward Sword are learned in the vicinity of the Thunderhead, except for Ballad of the Goddess.