Meat Elysium

The fifth world Lin Sanjiu visited. Ji Shanqing also goes with her.

Apocalypse
Particles escaped from deep within the earth that turns anyone they infect insane.

It is revealed that this only occurs if people eat food with calories that are infected with particles, as all food in this world have calories, it is basically impossible to eat anything.

It is revealed that this apocalypse was caused by an unknown post-human.

The insanity means that no natural post-humans are in this world as abilities are tied to a post-human's consciousness. This can be counteracted with either:
 * 1) Pure Growth Value, but this becomes harder and harder as people eat more and grow more infected.
 * 2) Eating Human Meat, which turns you into a duolouzhong.
 * 3) Eating Duolouzhong, which turns you into a cross between a post-human and duoulouzhong called a Jaeger.

Jaeger
Half post-human, half doulouzhong - Jaeger's are typically insane but regain sanity for a short period of time after eating a doulouzhong.