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In Shinsekai Yori (From the New World), humans with Cantus powers are
prevented from attacking each other by:

  * **Mental Restraints:** It prevents humans from intentionally attacking other humans.
  * **Death Feedback:** If a human kills another human, the attacker dies as well.

This is what keeps humans with Cantus powers from destroying each other.

![enter image description here](https://i.stack.imgur.com/3e37el.jpg)

Akkis (translated as: fiends (UTW subs), ogres (Crunchyroll)) are mentally
unstable and are able to break the mental restraints. So they have no problem
attacking other humans. But what about the death feedback?

How are they immune to death feedback? What makes them different from normal
humans?


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from-the-new-world
How are Akkis (fiends/ogres) immune to death-feedback?


The Death Feedback is part genetic and part conditioned. From episode 4, they
mention that the human genome was modified and that the Death Feedback works
by the subconscious becoming aware of an attempt to harm another human and it
uses their power to stop liver functions and parathyroid glands. This is
further reinforced by education, conditioning and hypnosis. I think in episode
12 Tomiko speculates that it could be possible to circumvent the Death
Feedback if the user was on some kind of stimulants or somehow didn't
recognize their targets as human.

This is possibly why the monster rats can raise a human child as one of their
own species, and the child will grow up not recognizing humans as his/her own
species so the child would be able to kill humans (but not the rats). It's
also mentioned that the ogres are genetic mutations, possibly without the
Death Feedback genome, but that wouldn't account for the rats stealing human
infants since there's no guarantee that the infants have the mutation.


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answer


There are **悪鬼** (Akki, lit. "evil spirit", translated as "fiend" or "ogre")
and **業魔** (Gouma, lit. "karma demon"). The former, a.k.a. **Raman-Klogius
Syndrome** , or the "fox-in-a-henhouse syndrome," is genetic. They are PK
users with mental instability caused by stress, seeing the world as the source
of their problems, becoming one that kills with no sense of guilt or remorse,
like a serial killer. The latter, a.k.a. **Hashimoto-Appelbaum Syndrome** ,
are PK users who subconsciously lose control of their powers due to stress and
distorts everything around them, due to a genetic defect, like depression.

In short, those who kill with Cantus purposefully, are called "evil spirits"
(translated as "fiends" or "ogres") and those who corrupt with Cantus
subconsciously, are called "karma demons." The former externalize their stress
& blame the world for their problems & actively turning their Canti against
the world (like having homicidal tendencies). The latter internalize their
stress, making them apart of themselves and try to cope or adapt and function
in spite of it. They focus so much on the stress that they slowly lose track
of other things (like depression), resulting in the leaking of their Cantus.

The minds of both are broken by stress, but how they deal with it ultimately
determine what they become.

"Evil spirits" rid themselves of the morals and duties of society, don't see
humans are human, but rather problems that need to be fixed ("Screw
everyone!"). Kinda like a car being used to run over animals on the road,
because the driver think it's fun or they hate animals.

"Karma demons" still hold on to the morals and duties of society, and see
human as humans, but cause unintentional harm to them as they try to cope with
their internal issues ("I cause problems for everyone"). Kinda like a car
emitting poisonous fumes or leaking oil (and causing fires), due to some
mechanical problem.

Shun does not hurt people because he wants to, so he becomes a "karma demon,"
but the "Messiah" freely wills to harm people, thus becoming a "evil spirit."

All humans have the disposition to become either, but how they handle the
stress ultimately determines what they become. Saki is able to balance the
internal and external conflicts with stress and use it for the good of the
people.


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