The Source, Root of Akasha, God, Truth, The Universal Unconsciousness, many were the names Man gave to the absolute existence that allowed all else to exist. At the "centre" of all creation, this existence could be truly called Omnipotent and beyond Logic and Common Sense, if any were to use it's power.
And now, as two great legends were chosen from two different spheres of space time, this Omnipotence was put into use.
One was from a brighter and yet darker world, where gods and demons consorted with men. Where alien beings protected their foster siblings and Heroes sailed the skies to protect Truth, Justice, and their ways. And the greatest and first of them….was Superman.
Doomed planet. Desperate scientists. Last Hope. Kindly couple. With the great power granted to him by the yellow sun of Earth, Kal-El/Clark Kent/Superman fights for Truth, Justice and the American Way, and still has time to be the world's greatest hero.
And the other from a moonlit world of vampires, TYPES, Heroic Spirits and mages. Where men shed oceans of innocent blood in a mad dash to reach the Root of all Things for reasons only they can comprehend. Where power is determined by laws and time, and magic crumbles each generation.
In this world, Gilgamesh is the greatest and mightiest of these Heroic Spirits, with each worth an army of mages. The two thirds divine King of Uruk, resurrected as the Servant Archer for the Fourth Great Holy Grail War, is a giant among giants, with his power so great and insurmountable, that he could destroy the World itself if he had the wish to do so. Possessing every treasure and Noble Phantasm ever made, Gilgamesh was well ranked as the King of Kings.
And now, these two behemoths of power and legend, would meet each other in a world empty of all humanity but not it's creations, to assess who was the greater power.