Long ago, Schiller had seriously considered how to allow the two worlds to communicate. He did not mean merging the two worlds, because such a fusion could lead to far too many unforeseeable consequences.
But some degree of exchange was necessary. The two worlds differed greatly in style, so there were naturally areas where they could complement each other. Last time, Main Universe Batman's soul had accidentally entered Stark's body, and the collision of their intellects had produced many positive effects. But that had ultimately been an accident.
Schiller had always wanted to find a stable channel that would allow characters from the two worlds to interact. Unfortunately, Schiller was human. He lacked the transcendent perspective of a god. Many things that were obvious to gods remained mysteries to humans.
But Schiller had not taken the path of trying to understand gods with a mortal body. He chose to command gods directly.
Yet even nearly omnipotent gods needed to be suited to the task. Schiller had tested Eternity a few times before, but Eternity did not seem to know much about matters beyond the greater universe. In other words, even at Eternity's level, he might merely carry out orders without understanding the secrets hidden behind that boundless void.
Schiller knew that OAA surely knew everything, but commanding OAA would be far too troublesome and would require paying a considerable price. So Schiller settled for the next best thing and set his sights on Oblivion, the most mysterious of the Five Deities.
The facts proved that his judgment was correct. Although Oblivion was on the same level as Eternity, its special nature gave it a greater understanding of the nothingness beyond the greater universe.
Oblivion did not explain the structure of the universes beyond the greater universe in detail. But when