The Void.
Damien knew it as the origin of everything, he knew that he could reach it by continuing on his path of conquering the foundational laws, but he still didn't have a true, inscrutable definition of the concept.
It was similar to his situation with Universal Law, but far vaguer, to the point where he didn't believe he'd ever be able to perfectly describe its existence.
[We call the Void our origin, but it is not our direct Ancestor. Our mother is another entity entirely.]
The 2nd Primal Sovereign's first words already shook Damien's perception.
When this creature said "our," he wasn't merely referring to Space Beasts or even Primal Sovereigns, but all of his siblings, including the universe itself!
A new form of existence was forced into Damien's worldview, separating him further from the Void.
[We came second, yet, we are all creations of the Void the same, regardless of our nature.]