Kodoku

is a type of sorcery. It is a magical art which is to close venomous insects or lizards in a vase and to make them kill each other. The only survivor turns into a creature called kodoku. Naraku uses this sorcery with demons imprisoned in a miasma, hoping to absorb kodoku for his new body, as it had been severely damaged by Kagome previously.

However, Inuyasha arrived in the cave and gets into a fight with the surviving demon causing him to be in danger of becoming a kodoku himself. Before he could, Kikyō destroys the seal keeping the demons there, thus saving Inuyasha but also allowing Naraku to get his new body. Miroku is the first to realize that the battle between the demons in the cave was an attempt to create the kodoku.

Media appearances
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Manga

 * Chapter 118
 * Chapter 119
 * Chapter 120

Anime
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 * Episode 32
 * Episode 33

Kodoku Kodoku