After the Lord of the Abyss awakens

Legend has it that all demons in the world originated from the abyss and were shaped by the Lord of the Abyss
The beginning of the Demon Era
The abyss changed drastically, and the demons left
Year 1034 of the Human Era
The young man with a dusty face walked out of the cemetery, and the first thing he said was:
"Where are all my children?"

Before his death, Zeus was most worried about his children, fearing that the young and pitiful "They" could not survive in the abyss.

However, he did not expect that after his death, his children broke through the entire abyss, pushed him to become the Lord of the Abyss, and searched for him all over the world?!