When he first came to the Void, Damien did something similar. He made some changes to the timeline to set the path he'd followed in stone, and in the process, he questioned who was leading him along his path the entire time.
He did not have to look any further for the answer, for he himself was it.
Damien saw now even that moment. He could even change it if he pleased. There were no longer restrictions, so if he wanted to, he could alter anything and everything to turn his path into something else.
His history was whatever he wanted it to be. This was what the Dark God was aiming for.
'But, he would not have reached his goals.'
Damien had no desire to, but he could feel in his soul that bringing the Worldwalker back was impossible. As he sacrificed himself and became one with the Void, he was no more than its energy and essence. He truly did not exist and could not exist. That was the eternal price he paid to save his people.