Gerald spoke about his experiences and the main reason he appeared ten million years ago to save this universe.
It wasn't because he was righteous; he had a personal reason.
It turned out that he discovered an extraordinary treasure the first time he entered the Abyss. That was also the last time he went there. After coming out of the Abyss, he is unable to find a way to enter again.
As for that pocket dimension, it was destroyed by Lin Hao later.
The extraordinary treasure he discovered was the Abyssal Demon Heart.
According to Gerald, Abyssal Demon Heart was left behind by a powerful Abyssal. That Abyssal was so powerful that when it died, its heart remained. The heart is said to be enormous, as big as a giant star. It was hidden deep in the second layer of the Abyss.
