Earth 616 (Marvel Comics).

Nightwing felt his very being drifting towards one of the two brothers.

As he came closer, the color died down to just a bright red.

Dick saw visions of this world's history, some of which belonging to the multiverse it resided in. He could see that it was similar to where he came from in many ways, serving as a home for many heroes and villains alike, big and small. There weren't any kryptonians or batmen or a Justice League, but their world still had protectors. He saw the Avengers, X-Men, Guardians of the Galaxy, and others. It instilled him with a sense of hope unlike anything he'd ever felt before. To know that no matter where he wound up, there were good people still fighting for what was right. Good people that may be able to help him find his way back to where he came from.