Earlier, when hunting the Demon Commanders and Extraordinary Great Demons, Huang Yu had accumulated a considerable number of Soul Crystals.
After Demon Suppressing City was upgraded to Tier Four, Huang Yu raced against time, using the supplies transported through the teleportation channel and spending Soul Crystals to continue upgrading Demon Suppressing City's Sub-Spark to Tier Five.
Only then did he upgrade the newly applied Demon-Slaying Wall to Tier Three, immediately followed by upgrading all the special buildings in the city at once.
Considering the environment of the Abyss, when upgrading Demon Suppressing City to Tier Four, Huang Yu did not use Spirit Nurturing Jade Stone, Soul Nurturing Stone, or other Special Building Materials that would grant production- or living-related amplifying Territory Traits.
Instead, he chose Kun Jin Rock, Profound Void Jade, Water Cloud Stone, and Demon Purifying Stone.
Kun Jin Rock gave Demon Suppressing City the Earthquake Unmoving trait, strengthening its durability.
Spells below Tier Five would have difficulty causing excessive damage to Demon Suppressing City.
Profound Void Jade gave Demon Suppressing City the Extra Space trait, expanding the Sub-Spark's radiation range and bringing the area within two thousand meters outside the Demon-Slaying Wall into its range as well.
At the same time, this meant that the Lord Statue's functions could also affect that area.
Demon Suppressing City's Sub-Spark radiation range now almost overlapped with the core area of the God Suppressing Realm Seal.
From then on, enemies at Extraordinary and below would be unable to fly within two kilometers of Demon Suppressing City.
As for creatures above Extraordinary, due to the suppression of the God Suppressing Realm Seal, they would be unable to use abilities above the Extraordinary level in the core area.
The sky above Demon Suppressing City would belong solely to the troops of Huanyu Territory!
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