Mo Zhao was also very familiar with astrology even though his knowledge was not as broad as Di Fuyi's. He knew the old King Star would fall soon and that a new King Star would be born within this period. However, if the Omen could kill the new King Star before it matures, then the Star of the Omen would replace the new King Star and become the new Lord of the world. Of course, the people would need to worship the devil by then, and the structure of the continent would be changed entirely.
He had this intention a long time ago; hence, he was waiting for the new King Star to look for him because the new King Star would be weak and easy to be killed at an earlier stage.