Go to the Little Demon World!
He had no idea how to seal and close the Door of Darkness.
Most array formations and restrictions could not do either of that.
But what if the source of the Ancient Demons' return to the human world was cut off?
The source was the Demon Soul Fruit Trees. Destroying three, no, even one of them could stop the Ancient Demons from coming through the Door of Darkness.
There were 18 Demon Soul Fruit Trees and three Ancient Demons, six for each of them.
If one tree was destroyed, it meant that one Ancient Demon would not be able to complete the breakthrough.
Would this Ancient Demon watch as the other two Ancient Demons became stronger?
No way!
It would seize the Demon Soul Fruit Trees and attack the other two Ancient Demons.
As a result, the three Ancient Demons would fight it out with one another.
If three Demon Soul Fruit Trees were destroyed, the battle would only be more intense.