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The Power Ring is a device worn by members of the Green Lantern Corps, an intergalactic peacekeeping force, that allows its wielder to project green energy constructs.
One Green Lantern, Yalan Gur, arrived to aid the humans, Amazons, and Atlanteans in driving back hordes of Parademons. Gur fought off Parademons with his power ring in the shape of a mallet, but after Steppenwolf stabbed and killed Gur, the dead Green Lantern power ring flew from his hand and back into space.
With the Ring, a Lantern can generate any solid constructs of light-based energy that they can imagine. During Steppenwolf's attempted terraformation of Earth thousands of years ago, Yalan Gur used his ring to generate weapons to battle Parademons. At his death, the ring flew off his finger and into space.