Sansan

When a glorious old civilization was toppled overnight, a strange purple moon rose and thus began the Purple Moon Era.
Damn it! What kind of ecosystem was this? The evolution was messy. Even rabbit bites and plants were not to be messed with. How can one survive all this? Evolve into a Purple Moon Warrior? What did this have to do with the Purple Moon?
What kind of map was this? The Safety Sector? The Floating Domain? The Darkness Port? The Storm Voyage? The True Capital?
The Horror Lullaby List? The resurrection of the Underground Race and the prospering Underground City? The Chaos Black Market that suffused the world? The Bloody Road?
More importantly, one could end up in a bloody slaughter when dreaming and enter the Dream Domain? Fine, this damned era! 

Dark Moon Era

Watching that indomitable and enormous monster with its unknown abilities terrorize the land, Tang Ling's forehead was drenched in sweat whilst his mind was running wild with all sorts of thoughts.

"This era… Has even the oxygen level changed?"

If the oxygen level was the same as the old civilization, it was impossible for such a huge monster to exist because the concentration of oxygen in the air was not enough to support a living being this size.

So what if the concentration of oxygen in the current era was higher than the old? What would happen to humans then?

Oxygen toxicity would happen because the lungs of humans could not bear the high concentration.

Besides, if the current atmosphere contained higher oxygen concentration, the human body would surely evolve drastically to adapt to the era, so why did the humans remain the same as those from the old civilization?

Level 3 Vicious Beast