As for the "wedge" used to summon the Spirit Realm, it naturally had certain prerequisites.
There were two conditions.
First, the environments of the upper and lower realms did not need to be completely identical, but they had to be at least eighty or ninety percent alike.
Since their birth, most realms had been fundamentally based on heaven-and-earth primordial qi and spiritual qi. The Taichang Realm was naturally no exception.
Thus, it basically matched the Spirit Realm.
Second, the proportion of each race within the population.
The Heavenly Dao was utterly impartial, and thus without emotion.
Yet the will of heaven within a realm could show favoritism.
For instance, if the Devil Race came to the Taichang Realm, the will of heaven in the Taichang Realm would target the Devil Race.
That was also why one could not rashly undergo tribulation after arriving in another realm.
What influenced the will of heaven was the proportion of each race among the realm's living beings.
If humans were numerous, the will of heaven would favor humans.
Though it would not protect them with all its might, neither would it deliberately target them.
Therefore, it was necessary for Tian Luo Realm to bring these Devil Race members to the Taichang Realm.
After all, bloodthirsty beings like Demonic Beasts did not count.
Thus, after clearing out the human race, they needed to summon the Devil Realm's "wedge" to replace the Spirit Realm's "wedge."
Besides contaminating the Taichang Realm with demonic energy, they also needed a large number of Devil Race members to raise their population base.
As for who would receive the credit for winning this realm for the Devil Realm, that would depend on who was in charge of this matter between the upper and lower realms.
Of course, if the Xuan Mo