Koukaku
A Koukaku kagune (Japanese 甲赫, romanization kōkaku, English shell-red) is released below the shoulder blade. Due to its high density of Rc cells it is heavy and extremely robust, giving it the greatest sturdiness and making them very well suited for defense. Normally, they are generally shaped into armors or shields, but on the offense, they can be shaped like melee weapons such as drills, hammers, blades, and swords.
Due to its high weight, a koukaku's speed is inferior to all other kagunes and the kagune is hard to wield.
A koukaku can fend off an ukaku onslaught using its guarding capabilities. However, a rinkaku kagune can deliver severe strikes against the slow koukaku, breaking their kagune and breaching their defenses.
Known Koukaku Ghouls are: Hinami Fueguchi, Ryouko Fueguchi, Ching-Li Hsiao, Arata Kirishima, Mairo,Matsumae, Ikuma Momochi, Naki, Nutcracker, Nutcracker's partner, Donato Porpora, Rou, Tanaka, Mirumo Tsukiyama, Shuu Tsukiyama, and Kuki Urie.

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The Book Of Kagune
Ciencia FicciónI'm sick of people asking me about the different types of kagune so here's a story dedicated to it.