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While at the beginning of the manga it seemed to be an overpowered gun, it grew to be the most powerful weapon in the entire series. Killy states that he doesn't recall the origin of the weapon, though I believe it was the only perfected GBE that could sustain such a high output for long period. A few particularities about the weapon, it was a highly condensed bullet of energy, which could repel beams from other weapons (seen in the Corporation against the Guardians), and can blast through larger forms of the GBE, seen at Toha Heavy Industries.
It also draws on the power of the user, hence the reason why Killy is suited to using it, and he makes a point of being the only person to fire it (by not allowing others to use it). This might also be due to the severe blowback of the beam, flinging the user back if used at higher power levels. It never 'runs out' of bullets therefore, and has unlimited ammo so long as the user has power. There were very few occasions when the GBE had no power. Inside Toha Heavy Industries , where the Safeguard aren't allowed access, Ivy (one of the Silicon Creatures ) states that 'the weapons of the Safeguard are disabled', so the GBE is not permitted to work. This also happens in the alternate universe inside the Gravity Furnace . Later when he met Dhomochevsky, Iko managed to stop the power of the GBE for a split second, giving Dhomochevsky an advantage in firing his own weapon. Incidentally, Iko called the GBE a 'Class 1 Critical Effect Weapon', obviously a powerful category.
Whenever Killy loses the weapon for whatever reason (stolen, dropped, borrowed), he always gets it back, searching constantly for it, and even breaking through walls to get to it.
Nothing can stop the beam once it has been fired. Anything that appears in its way gets a large hole in its body (i.e enemies) and also huge holes in the Megastructure. It is the only weapon capable of penetrating the solid layers between levels of the Megastructure. Killy also surprisingly uses it to defend Cibo when another Safeguard fires a GBE at her. He shoots just the point of the beginning of the beam (i.e. the bit about to hit Cibo), and it is deflected away.
There were 5 distinct 'levels' of power.
| Not strictly, a level as such, but the state the gun is in when not being used. The back shows the different stages, and are all black to indicate no usage, and the front of the gun remains the same. |
| The most basic shot of the GBE. Killy probably uses this often at the beginning of the series due to the nature of the enemies he has to defeat, mostly Silicon Creatures, who can be dispatched with just one shot. This is also the most commonly used Level, due to the small amount of time it takes to charge, and how useful it is despite being so 'small' in power. He uses this against many SC and also against the humans at the port, and generally anyone who attacks him. Inside Toha Heavy Industries, in the Gravity Furnace , Cibo powers up his GBE to one level, which he then uses to attack the SC and create a hole in the Gravity Furnace to open up the space. Using this against Dhomochevsky, we know that this Level creates holes of 70 kilometres deep, and so it is a very deadly weapon even at its most basic.
The one bar on the top illustrates it powered up to Level 1. |
| We never see this Level being used, but its safe to assume that at one point Killy does bother to charge it up this far, though we never see it being used in the manga (where we see the back of his GBE).
Here, two bars are lit up, and light up in a clockwise order. |
| Same as with level 2, we never see it in action, only when it was shown as the precursor to the Level 4.
Three bars are lit up. |
| The most destructive mode for the first 3-4 volumes, used first against the President of the Corporation in the Capitol. Possesses much more strength than the remaining three levels, and shows it by the power expressed in the beam.
Here, four bars are lit up, including the central circle, indicating the increase in power. |