Prof. T.C McAbe
Kryptonian Scientist
Since Luthor meddling with the energies of the Omniverse/Multiverse was mentioned. Let me explain this. Everything was in flux, yet no one affected it in their fights and there were a sh1tload of fights. Only the physical clash of the two Supermen destroyed and recreated the realities. Only they had the power to affect it. Even if you are in doubt and say, no this power didn't came from them. Let me use Alexander Luthor to show you where everything in the DCU comes from, what the origin of the DC Omniverse is.
"Everything comes from Superman"
This is an established fact. You can read it in pre-crisis stories, the IC or FC. Superman is the source of the DCU.
That's why he can fights abstracts if he has to, that's why he can defeat Omniversal threats like Mandrakk and lift infinity.
Funny enough, one could argue that Goku too comes from Superman and wouldn't be like he is today. His childhood adventures were based on Wukong, DBZ however on Supermans story and the Krytonians. So yes, we wouldn't even have DBZ without Supes.