Sol

In The Legend of Zelda: Twilight Princess, a Sol is the power source of the Twilight Realm, often compared to the sun of Hyrule. They blot out the darkness. Zant seals the Sols away with the help of Ganondorf, and covers the realm with Twilight, and proceeds to merge the Twilight Realm with Hyrule. Link restores the power of the Sols, bringing Light back to the Twilight Realm. The power of the Sols gets transferred into the Master Sword, allowing Link to cut through the darkness.