Cherokee mythology
There is no one evil spirit in Cherokee theology. An asgina is any kind of spirit, but it is usually considered to be a bad spirit. Uya, sometimes called Uyaga is an evil earth spirit which works against the forces of good and what is right. There is also Nun'Yunu'Wi and Kalona Ayeliski, evil spirits who prey on the souls of the dying and would torment their victims until they died.