The Void's reflection had a lot to say, but it didn't have much it had the right to say.
It wanted to tell him how difficult his journey would be, how much stronger his enemies would be, what True Godhood was like, but the Void didn't permit it to give him any information or advice about those matters.
It might've seemed like it was restricting Damien, but it was actually the opposite.
The Void had never trusted someone so much. It had enough confidence in Damien to guarantee he could do it all on his own without an inkling of foreknowledge.
So it wanted to test Damien, to see if he also thought the same.
And since he did, since he could maintain his mentality even in a situation like this, it was absolutely assured of its choice in descendant.
Damien didn't feel it.
Perhaps because he'd completely inherited the Void Physique, he didn't notice it at all.