When he returned to the Spirit Flame Continent from under the sea, he was always extremely cautious to avoid being discovered. Yet, to not remain completely ignorant, he still managed to gather much information about the Spirit Cultivation Realm and the major events that had occurred. Therefore, he knew about the Delusion Void Array at the bottom of Illusion Sea, especially as a descendant of the Ning Clan, renowned for their Mechanical Array expertise.
However, he did not venture to explore it.
Because it was very puzzling why a Delusion Void Array would appear at the bottom of Illusion Sea.
