After learning of Supreme City's response, Qin Shaofeng truly did not know what to say.
The so-called unknown secret realm was actually just his Origin World Space.
Of course, it was not all of it.
Qin Shaofeng had merely exposed a portion of the Origin World Space within the Core Zone of the Dead Silence Desert.
As for those spirit herbs, they had naturally come from the Origin World Space.
Unfortunately, these things carried the properties of the Origin World Space. They could indeed allow the powerful Immortal Emperors of the Immortal World to increase their origin after consuming them, even advancing into the Dao Integration Realm.
But there were still shortcomings.
Much like Bai Xue'er and the living beings within the Origin World Space, they were subject to certain restrictions.
The only difference was that the Immortal World's experts fared much better than the living beings of the Origin World Space.
After all, the Origin World Space had now begun devouring the entire Immortal World. Naturally, it carried a trace of the Immortal World's origin power.
Though it was not strong, it was enough for Qin Shaofeng's World Incarnation to transform all the spirit herbs in the Origin World Space into a form suitable for people of the Immortal World to consume.
After consuming them, they could genuinely improve.
They could even advance into Dao Integration Realm experts.
However, Dao Integration Realm experts born in this manner would likely suffer some decline in strength once they left the Immortal World.
Still, the restrictions would not be nearly as severe as those Bai Xue'er and the others faced.
However, there was another very interesting point.
If experts who improved through the spirit herbs of the Origin World Space consumed too many of those herbs, quite a few problems would arise.