Green Lantern - Futures End #1

Each Green Lantern has a power ring that gives him great control over the physical world as long as the owner of the willpower and physical strength to use it. Although the Green Lantern ring of the Golden Age, Alan Scott, fueled magic rings worn by all subsequent Lanterns were technological creation of the Guardians of the Universe who gave the ring such deserving candidates. They form the intergalactic police, known as the Green Lantern Corps