Kodoku (蠱毒, curse poison), also called kodō (蠱道, curse method), kojutsu (蠱術, curse technique), and fuko (巫蠱, sorcery curse) is a type of poisonous magic found in Japanese folklore. It is the Japanese derivative of the Chinese Gu magic.
To create kodoku, sorcerers would mix several insects in a jar, and let them kill one another until only one s...