The vampire feeds on blood, the Raven Mocker (Kâ'lanû Ahkyeli'sk) feeds on life. The Cherokee feared these witches greatly.
They could appear as a withered old man or woman, and they would stalk the sick and dying. Their arrival was heralded by strong winds and the cry of a raven. More than one Raven Mocker could appear at a home where someone lay close to death. Only the presence of one, who knows how to repel them from the bedside where they would torment the person unto death, is a guarantee the person’s life would not be stolen.
The Raven Mocker would eat the person's heart in order to consume their life, unbeknownst to the family present. They are invisible. As they consume the flesh, they add any remaining years of life the person had to their own. Only the presence of a medicine man that can recognize them will keep them at bay.
They are afraid to be seen, because if this happens once detected in their true shape, they will die within seven days.
The cry of a raven announces that a raven mocker is nearby, and someone will be dying soon. The witches can only steal life force before death, because once buried they cannot steal the heart from a corpse.
Among witches, the Raven Mockers are the most feared. In retribution and jealousy, when a Raven Mocker dies, other witches dig up the body to desecrate it.
The author Manly Wade Wellman, included this mythic creature in his novel The Old Gods Waken
Amongst those anisgina things, I should offer that the Raven Mockers can be put down for near about the worst of all. They were given that name because they can fly if they want to, and when they fly, they make a noise like a raven. Reuben Manco imitated it for me, kraa-kraa, a pure down ugly noise. They make it their chief business to help a man to die, you might could say. If somebody gets down flat on his back, bad sick or wounded, the Raven Mockers fly in and crowd all round and over him like a bunch of, well, like ravens. Most times they make themselves right hard to see by air real man or woman except maybe a wise old Cherokee medicine man. And the medicine man has got to pray his strongest prayers and work his best and fastest and sensiblest with all the magic he knows, so as to keep those Raven Mockers off from one they're out to kill."
Stranger Than Fiction Stories by M.P. Pellicer