Deep in the mountainous forests of Japan, the souls of the trees themselves are animated as spirits called kodama. These souls can wander outside of their hosts, tending to their groves and maintaining the balance of nature. Kodama are rarely ever seen, but they are often heard – particularly as echoes that take just a little longer to return than they should. When they do appear, they usually look like faint orbs of light in the distance; or occasionally as a tiny, funny-shaped vaguely humanoid figure. A kodama’s life force is directly tied to the tree it inhabits, and if either the tree or the kodama dies, the other cannot live.
Kodama are revered as gods of the trees, and protectors of the forests. They bless the lands around their forest with vitality, and villagers who find a kodama-inhabited tree honor it by marking it with a sacred rope known as a shimenawa. Occasionally, very old trees will bleed when cut, and this is regarded as a sign that a kodama is living inside. Cutting down such an ancient tree is a grave sin, and can bring down a powerful curse on any villagers who do so, causing a prosperous community to fall into ruin.