The underground world of the The Great Primordial World was not just a manner of speaking. It was a real world, inhabited by the demonfolk.
The underground demonfolk, yakshas, white-furred flying zombies, flying yakshas, asuras, great asuras, asura kings, and demon emperors had a strict hierarchy, clear statuses, and extraordinarily distinct divisions of labor.
Like the Great Li Dynasty, Great De Dynasty, and Great Xuan Empire, it contained numerous dynasties and empires, in no way much inferior to the ten immortal sects, demonic paths, and demon clans.
There were also countless mineral veins, such as dharma crystal jade, as well as numerous demonic beasts, such as Underworld Blood Wolves.
This time, the underground world Fang Yu, Fang Han, Hongyi Commandery Princess, and the others had entered lay outside the Eclosion Sect and served as a place for the sect's disciples to train.
Of course, the underground demonfolk likely thought the same way.
As for who was training whom, that depended on whose strength was greater.
The moment Fang Yu and the others descended, Crane Immortal could not help cheering.
"Wonderful! You finally came down! You were so heavy!"
As Fang Yu's strength had increased enormously, so had his weight. Since he refused to use his own dharma power to fly, Crane Immortal naturally had to bear the burden.
"Here! Consider it payment for your hard work!"
Hearing this, Fang Yu chuckled and took out a pill refined from a demon core, tossing it to Crane Immortal.
Though they came from different worlds, the spiritual energy and vital energy contained in the pill were immensely beneficial to creatures from both worlds.
Thus, like a child given candy, Crane Immortal cried, "Wow!" and eagerly swallowed it.
"Delicious, delicious, so delicious! If I had enough of these, I could transform my body and