反魂香 Hangonkō is a legendary incense from ancient China which has the power to bring forth the spirits of the dead before those who burn it. Those who burn the incense will see the spirits of the dead within the smoke. Hangonkō is made from the hangonjū, a magical tree with leaves and flowers that resemble those of a maple or Japanese oak. Its smell can be picked up from over 100 ri away. To make hangonkō, you steam the hangonjū’s roots until the sap comes out. Then you knead the sap to make the incense. Even a small piece of this resin is strong enough to recall the spirits of those who died from sickness or disease. There is a catch, however. Hangonkō only returns the spirit for a short time, and they only exist within the smoke of the burning incense.