Quinque

A Quinque (クインケ, kuinke) is a weapon that is fashioned from a ghoul's kagune. Manufactured from a ghoul's kakuhou, the quinque emits electrical signals that stimulate the kakuhou to release and control the kagune. The quinque can be made into various shapes like axes, guns, shields or blades to a degree, but most still retain some characteristics of the original kagune. Another difference between a quinque and a kagune is that the latter cannot change its shape nor store or absorb anymore Rc cells other than what was harvested from the ghoul it was made from.

It appears that a certain type of quinque is edible for ghouls, as seen when a rampaging Kaneki devours Shinohara's Arata without any ill side-effects afterwards. If the same can be said about the non-armor types is unknown at the time being.

Only CCG's rank 2 ghoul investigators and up are permitted to use quinques. The ghoul investigators transport them in bags or suitcases.

Chimera Quinque
In rare cases, a Quinque can also be fused from two Kagune. The most notable of these chimeras belongs to Akira Mado, combining the Koukaku and Bikaku styles into one effective weapon. It can also be made possible when the Ghoul in question naturally possesses two RC types, as in the case of Nutcracker.

Chimera Quinque are useful for opposing multiple types of Ghouls, though it is unknown if any combination of RC types is possible or can occur naturally as Chimera Ghouls are extremely rare and the technical difficulties of fusing two RC types together means that very few are capable of being used in the field.

Kakuja Quinque
Kakuja Quinques are special types of Quinque created from Ghouls that have cannibalized and evolved a mutated Kagune, becoming a Kakuja. So far it has been shown to function as armor, protecting and enhancing the capabilities of the user by stimulating their body while equipped.

So far, it seems to not be sustainable for long since the Quinque comes with the drawback of slowly biting into its user the longer it is maintained and feeds off the wearer's vigor in order to conserve energy.

Majority of known Kakuja Quinques were harvested from the Kagune of Arata Kirishima and used by Shinohara, Iwao Kuroiwa, Koutarou Amon and Juuzou Suzuya. While, the Quinque "Owl" was harvested from the Kakuhou of Yoshimura and used by Kishou Arima.