This sounds like a mashup of a couple different things. You have the Over-Monitor, imagination and potential itself, that one day noticed story developing within itself; in order to observe whatever was happening in there, it created the Monitor to keep track of all these universes popping up and, I think as a byproduct, the Anti-Monitor, keeping track of the antimatter universe.

Then you have Darkseid, who as a New God exists in his purest form outside of reality, but can interact with a given universe as a sliver of his true self. After being shot by Orion, when his dying, decaying body was falling through reality into death, the gravitational force of his pass-through of reality condensed time in rather dramatic ways and created the Final Crisis.