So there's two Green Lanterns in this comic. One of them is black. That's not a weird figure variant. There are actually a bunch of Green Lanterns (something on the order of 7200, I believe), so two of them being in one comic isn't odd or out of the ordinary.
I don't know if GL has ever made kryptonite from his ring before, but I don't see why he can't fake it.
 
    

When evil spreads across the land, and darkness rises and the monsters roam. When the creatures of the night make beautiful music, and the things that go bump in the night go bump with greater enthusiasm. When the world is in peril and is in need of a hero...

These guys are, sadly, the best the world can hope for. These are the adventures of the heroes of CVRPG. They mean well, they try hard, and occasionally they do the impossible...

They actually do something heroic.