Killy

[Gravitational Beam Emitter - Hypothesis 1]
Gravity, even when emitted as a beam, does not have that much power.
So where does the immense power of the Gravitational Beam Emitter come from?
Perhaps, like the Gravity Furnace, it comes from Dark Matter intervening.
That is, if the beam hits one certain place, it transforms into an entirely different location where an extreme amount of dark matter suddenly occurs. The thing's mass increases explosively, a reaction that would cause anything to be destroyed.
Since it changes the attributes of the place where it hits, it could be called, "Installation Emitter" maybe.
—http://www.randomisgod.com/blame/Artbook83.html

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[Gravitational Beam Emitter - Explanation 2/Type One Variable Critical Arms]
Iko called it the "Gravitational Beam Generator" but it's actual name is this one ((referring to "Type One Variable Critical Arms")). The people on the Forbidden Level of the Life Electric Company also called it "Gravitational whatever" as a name that describes its functions directly.
But in the end, "Type One Variable Critical Arms" is the true name of Killy's weapon whereas "Gravitational Beam Emitter" is just a description.
So what does it mean by a "Weapon" that is "Critical" and "Variable"?
The only ones to use (possess) this weapon are Killy and Sanakan, and Sanakan only utilized the "Great King ((Not sure about this word here))" so that's the situation.
As for the reason, it takes place on the various stages of the story of BLAME!, "The maintained Lower Level where Killy was wandering," "The Electric Life Company's general Forbidden Level," "Toho Heavy Industries, where the Governing Agency's influence does not extend," "The Informal Layer," and the "layer damaged by Level 9." BLAME! is mostly full of places where the Governing Agency, Safeguards, and the like are unable to function, I would say. And so if you consider those circumstances to be true, they would have come across no other weapons.
But, I wouldn't say the Safeguards are under inefficient command. Since in Sanakan's final flawless form in the scene at the Silicon Life headquarters, the gun she was using was a pressure release gun. And also for Sanakan to attack she had a downloaded a high level exterminator which one can think of as not being able to be taken down by fire power or strength. The same is so with Killy's gun, and it must be the most powerful weapon in that world.
So why was the unsteady Killy able to carry such a thing?
Well as you should know, it's because he's this really extraordinarily special person.
As expected, is it because he's the "Secret System Messenger"....?
This brings us back to the previously stated problem.
What does it mean by a "Weapon" that becomes "Critically" "Variable"?
In the whole of this world, the Builders have created a layered world that is, in actuality, a level that is the same size as the Solar System. And inside of that entity is one atmospheric pressure of breathable air circulating about the whole thing as well as regularized gravity.
That kind of environment is impossible to create naturally, however there is some way or another to control that kind of thing artificially.
Naturally, the largest restructuring was taking control of the gravitational power, and undoubtedly, within the Megastructure there are controls.
If control over the gravitational power was lost, the only possibility is that the layers themselves would instantly collapse.
With that in mind, is there even a "Variable Critical Arms"?
Concerning controlling gravity, Killy's gun "emits" "beams" of "gravitons." It is the ultimate "arms" who's "critical" point is creating a situation where all "variables" have failed.
Blam! It cuts down places developed with artificial gravity with its straight beam and causes localized gravitational failure.
Since using such a thing haphazardly would be rather dangerous for the world if used carelessly, its owner is controlled carefully.
Sanakan is of a uniquely high rank which comes along with responsibility of such a weapon.
So on the other side, afterwards, from the Governing Agency...... the Level 9 Investigation was maybe also given such responsibility..... hm?

—http://www.randomisgod.com/blame/Artbook84.html