Kodoku

is a type of sorcery. It is a magical art called fuko 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.

History
Naraku used this sorcery with demons imprisoned in a miasma, hoping to absorb kodoku to create 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 destroyed the seal keeping the demons there, thus saving Inuyasha, but also allowed Naraku to get his new body. Miroku was the first to realize that the battle between the demons in the cave was an attempt to create the kodoku.

Trivia

 * has been referenced throughout . The surviving creature of the mixed animals is used by the caster as a lucky charm to grant them great wealth. The owner, however, is required to feed the creature. Failing this would enrage the insect, if the owner does not equivalently repay the insect by placing all his or her riches beside a road, plus interest in gold and silver, the insect would devour its owner. The term "kodoku" also refers to the spirit which is the incarnation of this ritual. It usually appears in the shape of a worm or other animal. This concept has been referenced in various anime series as well.

Media appearances
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Manga

 * Chapter 117
 * Chapter 118
 * Chapter 119
 * Chapter 120

Anime
}} Kodoku Kodoku
 * Episode 32
 * Episode 33