Fang Bai trailed all the way and discovered that the aura of that Mysterious Demon Emperor finally vanished within Heaven Devouring City.
Fang Bai conjectured that the Mysterious Demon Emperor must be living in some Demon Dwelling inside Heaven Devouring City, and that he had definitely set up a Concealment Formation inside and outside that Demon Dwelling.
From this it could be seen that the Mysterious Demon Emperor not only understood the Array Path, but was also an absolute master of it; otherwise it would have been impossible to deceive Fang Bai, who had been unmatched in formations in his previous life.
Entering Heaven Devouring City under the identity of an early-stage Demon Emperor Realm powerhouse, Fang Bai wandered around the city, investigating the residence of the Mysterious Demon Emperor.
