Based on Korean Mythology
Gumiho's are the Korean nine-tailed fox. They use spirit majik and get stronger with each tail they have. They can be in either full human or full fox form. They can also bring out fox characteristics to their human forms. They can create beads of spirit majik which can amplify other majiks or heal others. Only a fox with all nine tails can make more than one bead. If they are separated from their bead (only one) for more than one hundred days they can become human.