It's called the Theory of Quantum Entanglement.
All matter and energy in the universe, everything that has ever existed, originates from a single point: the singularity at the heart of the Big Bang. Despite billions of years of rapid expansion, matter has been shown to still be linked on quantum levels; if an atom on one side of the universe is agitated, another atom on the other side of the universe will respond in kind. Despite being separated by unthinkable gulfs of space and time, on an extradimensional level, all things are still one.
When Darkseid's Omega Beams hit me, I am scattered into nothingness. I am nowhere.....yet I am everywhere at once. On a quantum level, I still exist in every point I have ever traveled in my life.
I am on Krypton, only a few days old, seeing my birth parents for the very last time as they place me inside my ship.
I am in Smallville, desperately trying to work up the courage to ask Lana if she wants to go to the movies with me this Friday night.
I am in Metropolis, appearing in costume for the first time, saving Lois Lane from certain disaster, as awestruck by her courage and frankly her beauty as she is by my powers and abilities.
I am in Gotham City, helping a suspicious and feared vigilante hunt down a killer named Magpie, unsure if I can really trust this Batman or if I should bring him in as well.
I am fighting alongside the Justice League of America, one of the most powerful gatherings of metahumans ever assembled.
I am standing amidst rubble in front of the
Daily Planet, prepared to lay down my life in order to stop the rampage of Doomsday.
I am staring in disbelief at the election results, unable to process the fact that Lex Luthor has been elected President.
I am out among the stars, uniting two warring species after learning they had been manipulated by the planet-conquering Starro.
I am within the Source Wall, battling the deranged and vengeful spirit of General Zod, reality itself warping and splintering in our wake.
....
there. This is what the Ascension Project was intended to do.
Fifty thousand years at the heart of the sun, channeling the power of every counterpart of myself from every alternate universe.....it was to do far more than simply be able to punch Darkseid in the face.
The Omega Beams were the only things capable of dispersing my physical form after having absorbed so much solar energy. That energy is what keeps my consciousness active in the universe, rather than simply advancing to the afterlife yet again. I'm still in every one of those places...
...which means I am still connected to the Source Wall.
I am still intertwined with the very makeup of Creation itself. In essence, I can remake the universe as I see fit.
Jimmy Olsen said the Ascension Project was to turn me into a god. And he was not exaggerating.
Back on Earth, Darkseid and his minions fight off the combined forces of the Justice League and half a dozen different Lantern Corps, with the whole of creation at stake. Bruce is confronting Darkseid himself, Dick has just taken down Desaad, and Diana has Kalibak on the ropes.
All of existence is fighting for its survival, against a being who wishes to convert or destroy everything that isn't himself.
Before Darkseid, a light emerges, a rift of golden sunlight opening up through time-space, blinding and brilliant before the God of Evil. It is through this portal that I emerge, the Ascension complete.
"As I was saying, Darkseid...."
"....this ends now."