system
Given the following post, respond as if you're commenting on Reddit:
human
[Green Lantern] What can't a Green Lantern ring do?

Green Lantern rings are known for being able to create constructs and do pretty much anything. On the most extreme end I've seen GL's time travel, ressurrct themselves from the dead, and recreate entire cities with people and animals.

Is there a limit to what a ring can create? Can a ring create drinkable water as an example? Is magic off of the table? Is there any object whose physical properties prevent a GL from imitating it?

Edit: Thanks for the award and for this blowing up!
gpt
The ring can do anything. It's been shown to create portals, make the wearer invisible, allow time travel, manipulate minds, phase through walls etc.

It can do anything you can imagine. Provided you have the will.

Hal Jordan's ring resurrected him from the Black Lantern Corps & he used it to kill a Guardian of the Universe even though they deliberately programmed it to be impossible. Sinestro used his ring to make another ring.

I think the only exceptions are magic (For obvious reasons & the fact that the Guardians hate magic) & New God technology like Boom Tubes.