Ewah (or Ew'ah, the Spirit of Madness, or Underground Panther), in the Cherokee folklore of East Tennessee and Western North Carolina, is the demon of madness. The very sight of this nocturnal demon is enough to cause permanent, irreversible insanity. He feeds upon the dreams of children and lives in the forest. Ewah is afraid only of the Wampus Mask, a magical mask made from the preserved head of a bobcat. It is said that the demon was ultimately destroyed by a Native American woman named Running Deer.
References
Ewah Wikipedia(Text) CC BY-SA