What was a Gu King?
Put a thousand Qi Refining Realm devils together to slaughter one another, and only one would survive, earning the right to enter Foundation Establishment!
That survivor was the true elite, a true killing machine!
Then a thousand such Foundation Establishment devils would slaughter one another again, leaving a single Golden Core devil!
A thousand Golden Core devils would, in turn, produce a single Nascent Soul devil!
Every devil had passed through layer upon layer of this brutal selection. Each had endured cruel trials, and their combat strength far surpassed that of cultivators at the same realm in the other worlds!
Under such brutal rules, who knew how many devils had to kill one another to produce a single Earth Immortal Realm devil?
That was a Gu King!
That was why there was a saying: at the same realm, devils were the strongest!
Only the Demon Race could match them even slightly in physical strength!
The other worlds struggled to contend with the Demon World on lower-realm battlefields.
Their most elite armies might only be comparable to the Demon World's ordinary armies!
And the Demon World's elite armies were nearly invincible!
The war on the First Heaven continued.
In the thirty-fifth year, an army from the Ghost Realm ran straight into an army of the God Race in a valley.
The God Race's twenty trillion angels formed the Judgment Formation. Bathed in its holy light, the Ghost Realm's sinister spirits and vicious ghosts should have been utterly suppressed.
But the Ghost Realm's ghost soldiers had never intended to meet the God Race head-on. They laid down a Trillion Soul-Devouring Grand Formation and forcibly turned the valley into a Ghost Domain.
Yin winds howled and ghostly qi hung thick in the air. Countless vicious ghosts crawled