Critter.
Remnants of fantasies that erode reality.
They are failed Cracking Beings, derived from a certain formula.
They are something that shouldn't exist.
In reality, it is impossible for them to remain here.
Many do not know of their name.
Like none of the regular students, for instance.
Only a handful know of its name, such as those on the other side of the world.
Critter. Powerful fantasies.
Rumor has it that in Inganock, a city in the foreign land of Kadath, did such an instance occur.
The death toll there was in the hundreds of thousands.
Although extremely rare, they can cause extremely serious damage if they occur.
They are perhaps equal to the largest Engine Arms in terms of the destructive power they bring.
Such as a group of mobile fortresses, for instance.
They are something fearsome.
They are something that distorts reality and devours it.
Critter.
Nightingale: In the end, my power is just a sham. The Others are merely just shadows and light.
Nightingale: But by weaving them together into a singular form does an offshoot become an exception. They gain functionality as a Critter.
Nightingale: That offshoot becomes a Critter, obtaining basic characteristics (skills) such as being physically invulnerable (invincible) and panic.
Nightingale: An old fantasy that just so happens to be coincidentally called Will-o-Wasp...
Nightingale: It fits with my Art of light and shadow. I'm merely using paradoxically.
Source: Gahkthun: Shining Night,
Goddess of the Night A