Billions of years ago the oldest known beings, the Guardians of the Universe, created an inter-galactic police force to serve and protect the 3600 sectors of space. The Guardians recruited only the finest beings from a multitude of planets; those capable of overcoming great fear. The Guardians armed the Green Lantern Corps with power rings capable of harnessing the green spectrum of energy, the spectrum of willpower, which is collected and stored in the Central Power Battery on Oa. A Lantern unleashes the power of the ring by channeling their own willpower.