Gloomy Demon Cave!
Named a cave, it was actually a grotto-heaven.
This was crafted by Yi He and the others from world fragments directly stripped from the earth of the main world.
The ecology within the demon cave was self-contained.
The omnipresent Nether Power, endless swamps, black tree stumps, and wandering nether spirits were the eternal themes of this place.
There was no distinction between day and night here; the sky was forever a clear gray, deep and eerie, with the wailing of ghosts and howling of wolves endlessly filling the air.
This was the paradise of the free and the hell of the weak!
There was no benevolence, righteousness, propriety, wisdom, or trustworthiness here, nor any moral constraints; the only universal value was that might makes right.
There was not a single kind soul here, only heinous fiends.
However...
Things were usually very peaceful here, even more stable than the most well-governed city in the mortal world, with almost no one committing evil deeds.
Everyone was a fiend, which meant there were effectively no fiends; perhaps this was a negative multiplied by a negative making a positive!
Just when these evil demons thought they could begin a peaceful slice-of-life era, their demon emperor gave them an opportunity.
An opportunity to quickly recover their magical power, regain their physical bodies, and even advance their strength further.
This opportunity was to devour the comrades around them whom they spent day and night with.
To merge with everything of a comrade, causing that comrade and oneself to completely fuse into one...
Then the peace and stability within the city vanished, and wandering nether spirits wailed and fought, resembling a ghost domain as all the nether spirits rioted and the battle cries shook the heavens.
Beneath the illumination of the nether spiritual light,