The Void showed Damien and the Dark God a story that nobody else knew. It was a story that was never told to the world because its main character wanted it that way.
Still, when these two people pleaded so earnestly, the Void had no choice.
For these two people especially, it was important to see.
It started in the Sacred Abyss. It started when the Worldwalker returned to that world and saw it covered in mementos of his brother.
No, it started when he saw his brother tearing down the singular statue of him that existed in that world.
At that moment, as he saw the raw emotion in his brother's eyes and actions, as he witnessed something so powerfully deep for the first time, he first took notice of it.
Still, it was at a far later time when that note became a true interest and curiosity.
What the Worldwalker witnessed more than anything else during his travels was "emotion."
