There are four Light Spirits: Ordona, Faron, Eldin, and Lanayru. These four spirits are the protectors of the light around Hyrule. Link has to revive them after Zant put out there light using his Twilight. Link has to defeat Twilit Bugs to revive them. In the end they put there powers together to make Light Arrows for Zelda to use in the fight against Ganondorf.