Green Lantern levels up to one of DC's most powerful superheroes

gamesradar.com:

So just what the heck is a Godstorm anyway?

The title of "most powerful Green Lantern" has changed owners a few times in DC. For a while, that user was certainly Hal Jordan's evil counterpart Parallax, after he nearly wiped out the Green Lantern Corps. Later, it would be Kyle Rayner, when he was possessed by Ion, the source of every GL's power. Now, it looks like it's another fan-favorite Corps member's turn to wield the title, although the way he's come by the power is unlike any of the ways its former users got theirs. 

You might have first noticed in April 26's Justice League #75, but this all started a little bit before.

In the lead-up to April 12's Green Lantern #12, which was drawn by Tom Raney and Marco Santucci, written by Geoffrey Thorne, colored by Michael Atiyeh, and lettered by Rob Leigh, a rogue Guardian named Koyos sought to destroy the power of the Green Lanterns, claiming it was a mistake against nature. 

To accomplish this, Koyos extinguished Oa's Central Power Battery, and with it, much of the energy that powered the Green Lantern's rings. The only hope of saving the cosmos and recreating the GL Corps was to literally reignite the flame in the Oa Battery. Needless to say, that would take a lot of power. Luckily for the universe, John Stewart has found that power, albeit from a surprising place.

During the course of Green Lantern #12, John encounters the Source. The most powerful entity in the DCU, the Source is the origin of creation, the energy behind all that exists in the Omniversal pages of DC comics. The Source is rarely, if ever, actually seen in comics, although for John, it makes an exception, appearing to him in the guise of the King of Comics himself, Jack Kirby. The Source knows of John's