The Longinus Knife, or Loner, is a melee weapon carried by all four members of the Bolverk Squad. The weapon's prototype is referred as Loner.
The Longinus Knife is a highly corrosive, electromagnetic dagger which instantly numbs the victim at mininum contact.
However, Longinus Knives are more of a suicide method rather than a weapon. A simple stab with its blade will short-circuit the cyborg and cause a large magnitude explosion. These weapons are allegedly coded with the user's DNA, meaning that a stab with the dagger will only destroy the user or something with a very similar genetic code.
Despite its marking as a suicide method, the Longinus Knife/Loner has seen more use as an offensive weapon throughout the series. This weapon and Kary's Glove are the only two weapons to appear or be mentioned in some way throughout the whole series.
Towards the end of their duel, Omega stabbed the alien being XV with his Loner. As the alien was linked to an imitating Omega at the time, it reacted as if it were a cyborg and promptly exploded. Somehow, Omega was able to survive even though he was wounded, probably thanks to his superhuman durability.
At a train station, Omega and Xero encountered robotic versions of themselves that the Overseer had sent to terminate them. The four cyborgs dueled matching each other's weapons. All four fighters were evenly matched, so Xero had an idea: if the heroes used their knives, they would be able not only to kill their clones in one hit; their clones would have no way of imitating them, since Longinus Knives are not meant for direct combat. All four pulled out their Longinus Knives at roughly the same time and fought with them before the cyborgs were able to stab their robotic doppelgangers. The resulting explosion destroyed half the city and their copies.
Omega tells Xero to keep his knife close in case the fight against Kary becomes a losing one. At the end of part 3, Kary plunges her knife into her abdomen because she was about to be killed by the infected Omega, ending her own life, and halting her major malfunction.
Loner compared to Longinus Knives Edit
The main difference in these otherwise very similar weapons is the shape and size of the blade. Loners possess shorter blades compared to the Longinus Knives, and do not have a toothed edge on the back side of the blade.
On the other hand, Longinus knives are larger and have an aforementioned toothed edge. Longinus Knives also have a few small gaps in the blade. Wether the Loner was a prototype of the Longinus knives or not is unknown.
- The name Longinus Knife may be a reference to the Progressive Knife and Longinus Spear of the 1995 anime Neon Genesis Evangelion.