As for how they found the Shadow Immortal Realm.
That went back to when Nan Hua and the Ancient Emperor had become acquainted while fishing in the Eternal Ancient Immortal Sea.
Back then.
When Nan Hua attained the Dao, his senses had naturally not been mistaken. A dignified True Immortal would not suffer hallucinations, nor would he doubt his own perception.
He had once asked Meng Sheng about it.
Meng Sheng had looked astonished and merely shaken his head. When he attained the Dao, he had sensed no existence of any Shadow Immortal Realm. His perception had been within the Eternal Ancient Firmament Great Dao.
Nan Hua sighed.
In the end, he braced himself and went to ask Chen Xun. Dao Ancestor, you were the one who assigned me this task. Now that you have attained the Dao, you cannot possibly leave it entirely to me alone, can you?!
Chen Xun spouted a great deal of nonsense with Nan Hua, nearly talking the latter into a daze. Black Bull was left utterly muddled by it all, almost beginning to doubt himself—but never doubting that Chen Xun was blowing bull.
Little Scarlet had plenty to say and an even greater curiosity.
In the end, Chen Xun shut him down with a single sentence: "You talk too much."
Finally, Chen Xun spoke mysteries and wonders to Nan Hua, telling him a great many things about the Reverse Five Elements Immortal Dao. Nan Hua left with the vague sense that he had gained enlightenment, feeling that the Reverse Five Elements Immortal Dao truly was unfathomably wondrous—it could even backlash against the Dao Ancestor's own Great Dao.
Many years later.
He snapped out of his epiphany and realized that Chen Xun still had not said where the Shadow Immortal Realm was!
Chen Xun was