Ever since Schiller returned to the Marvel Universe, he had noticed that the egg had begun showing signs of unusual activity. For instance, the thumping sound of a heartbeat had become more distinct. His telepathy could sense some emotions from within the egg, and gurgling sounds came from inside as well.
Schiller had initially thought the egg was about to hatch, so he had been considering how to handle it in order to maximize the returns.
But after observing it for several days, Schiller realized something was wrong. The heartbeat kept pounding, and the eggshell kept making noises, yet there was no sign whatsoever that it was about to hatch.
Moreover, as the life force inside the egg grew stronger, Schiller could sense the emotions of the life within more and more clearly. The cruel, mad emotions unique to Doomsday were almost spilling out.
Though he did not know why Doomsday from that DC Universe had become an egg, now that he knew the egg might contain Doomsday, Schiller naturally had to prepare in advance and deal with the monster.
Doomsday was difficult to kill. Or rather, in the DC world, he was difficult to kill.
Just as the murderous Jason was nearly immortal in the Friday the 13th world, it was not because they were truly so powerful that nothing could kill them. It was because of the power of the universe. In that universe, they were simply set to be immortal.
The Fourth Wall setting had always existed in American Comics World, so it could also be understood as the writers arranging for Death in that universe not to take Doomsday. Naturally, he could not die.
But Death in that universe would not take him, while Death in this universe might. Doomsday had an immortality setting in the