Power Rings - Green

Last, but not least, my very favorite of the Lantern spectrum. I give you the...

GREEN LANTERN CORPS (WILLPOWER)

In brightest day, in blackest night,

No evil shall escape my sight.

Let those who worship evil's might,

Beware my power...

Green Lantern's Light!

The power ring's most distinctive effect is the generation of green, solid-light constructs, the precise physical nature of which has never been specified. The size, complexity, and strength of these constructs is limited only by the ring-bearer's willpower; whatever the wearer imagines, the ring will create. No hard upper limit to the power ring's capabilities has yet been demonstrated and it is often referred to as "the most powerful weapon in the universe."

In the concluding issue of the Green Lantern: Rebirth mini-series, attention is paid to how the style of constructs varies with the character and mindset of the person creating them. Hal Jordan tends to create solid, workman-like constructs. John Stewart, an architect by trade, creates constructs with carefully-designed internal workings, almost like three-dimensional blueprints. Kyle Rayner, an artist, envisions highly detailed or wire frame constructs. Guy Gardner's ring is constantly sparking, even at rest, and his creations are simple, and often blurred by the excess energy his willpower causes. The alien Kilowog's ring, for reasons yet unrevealed is (according to Hal) "the only one that makes a sound," producing a loud sonic boom upon activation.
When active, a power ring will encase its user in a protective, life-supporting force field. This force field allows the user to fly, travel through inhospitable environments (outer space, underwater, etc.), and enter hyperspace in order to move vast distances quickly. The ring also generates its wearer's Green Lantern uniform: the uniform appears over their normal attire and vanishes at the user's will. The uniform varies from Lantern to Lantern, based on anatomy, personal preference, and the social norms of their race. The only rule in this regard seems to be that the uniform must openly display the symbol of the corps, though even this has been modified based on preference (a vampire-hunting Lantern adapts the symbol into a cross, and a blind Lantern with no concept of light or color uses the image of a bell).
Power rings also appear to be highly advanced computers; they are able to talk to and advise the wearer as to various courses of action, as well as act as a universal translator. Power rings are capable of generating electromagnetic radiation at various frequencies. This radiation can be focused by the wearer into a beam, similar in appearance and effect to a powerful laser. The ring can also scan for energy signatures or particular objects. Less frequently used capabilities include splitting atomic nuclei and manipulating subatomic particles (thereby transmuting chemical elements). A power ring is also capable of creating fully-functional duplicates of itself. While power rings have to be worn to be effective, at several points Green Lanterns have shown the ability to summon the ring to them from a distance (even if someone else is wearing it) or order it to carry out commands automatically after being removed. Some power rings have been shown to be genetically keyed to the wearer, like Kyle Rayner's, though villains have circumvented this this through various means. For instance, Manhunters use tissue samples to make Kyle's ring think it is still on his hand. When a Green Lantern is slain, their ring will automatically seek out a suitable replacement