Netherflame City.
This was a main city with an exceptionally unusual structure. It had formed around an enormous Greenflame Volcano.
The volcano covered forty thousand square kilometers, with azure-green nether lava constantly flowing from within its mountain body.
As the birthplace of the Netherflame Clan, the mountain had been transformed into something like a hot spring. From its base to its summit, it could accommodate over a million Netherflame Clan warriors bathing and recuperating together.
No matter how severe a Netherflame Clan warrior's external injuries were, soaking in the green lava would quickly heal them.
No one knew why the lava was so effective on the Netherflame Clan, because the clan had built an enormous city outside the volcano that covered one hundred and fifty thousand square kilometers.
The city had three walls, each two hundred kilometers long and one kilometer wide. Every wall possessed a God King Tier formation unique to the Netherflame Clan.
These were nether formations formed around the nether lava river flowing through the city, ancient beyond count, known as the Soul-Corroding God-Devouring Prison.
The Soul-Corroding God-Devouring Prison covered a range of two hundred kilometers. Any target entering its attack range would suffer simultaneous attacks upon body and soul. The green flames possessed not only extreme heat, but corrosive power as well. Unless one possessed a divine artifact like Heavenly Crystal, nothing else could withstand its corrosion.
Furthermore, the formation could destroy an invader's divine soul, driving them mad and even attracting heavenly demons to invade their bodies. The stronger someone was, the harder it was for them to withstand the formation's attacks.
The reason Trute and the others were not afraid of Hippocra launching a surprise attack on Netherflame City—and even hoped he would—was because of these four God King Tier Soul-Corroding God-Devouring Prison formations.