Tianyi Prefecture, Purple Cloud Prefecture, Dongliu Prefecture...
At the junction of the Star Luo Domain's five prefectures.
The earth cracked, forming crisscrossing ravines from which billowing black qi poured.
Within the black qi, blood-colored figures churned, letting out shrill roars.
Broken dark gold runes could faintly be seen flickering, submerged in the demonic tide.
This demon cavern, whose entrance alone covered dozens of miles and whose scale was unprecedentedly astonishing, finally erupted.
"Humm...!"
As the demon cavern erupted, demonic beasts rushed out of the deep valley.
Around this region, dense formation patterns shone, spreading and linking together into a crimson "umbrella."
It temporarily sealed the black qi within this region.
When the experts of the six first-rate forces, led by Blazing Sun Valley and the Nine Nether Sect and including the Four Symbols Sect, arrived at the scene.
This was the sight that greeted them.
Although Gongsun Yan had already given everyone a rough account of the Demon Abyss on the way.
When they witnessed with their own eyes the black qi filling nearly a hundred miles and the blood-colored demonic beasts surging like a tide.
Many present still could not help drawing sharp breaths, inwardly shocked by the scale of this demon cavern.
Many demon caverns had already appeared within the Human Race Territory, but one of such scale and momentum was indeed rare.
Judging from past experience, there were bound to be evil demons at the Source Emperor Realm level in this demon cavern.
And certainly more than one.
At this moment, as Gongsun Yan watched the demonic beasts inside the demon cavern battering the formation's light barrier, his pupils could not help contracting.
"This Crimson Sun Heavenly Net Formation took our Blazing Sun Valley over a year to set up. Its power is tremendous, and it has