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The Ke'let are "demons" in Chukchi mythology that hunt men, much like a man hunts game. I've never read an exact description of their appearance, but one gathers that they are a bit like ogres - big, generally man-like, and not altogether bright. They, like some other evil creatures, were believed to be the result of evil people who hungered for companionship after death and so tried to steal the souls of those they had known in life.
There are a lot of Chukchi stories involving the Ke'let. In one of them, a young man encounters a Ke'let just after he has caught a small seal. They match wits briefly, and the encounter ends when the demon invites the man to "eat some liver" with him, which sounds like pretty bad news for the protagonist. The young man agrees, but says he needs to fetch his knife from his boat. This the demon allows, but when the man reaches his boat he also grabs the seal he caught and stuffs it in his clothing. The man then takes the knife and pretends to cut himself open and pull out his own liver, but he's really just cutting open the seal beneath his shirt. Not to be outdone, the Ke'let grabs its own knife and proceeds to disembowel itself. As it turns out, extracting your own liver is fatal even for a demon.
This isn't the only story to portray demons as somewhat mentally deficient; in another tale, a woman is advised by the spirit of her dead neighbor that the Ke'let are coming for her. At his instructions, she kills her dog, makes a circle around the house with its blood, and the demons are convinced that the blood is really a deep river and turn back.
As with some of the previous stories I've posted from Inuit lore, the broad conclusion is that humans survive among these monsters with their wits, not their brawn. Fearsome and strong creatures seem to be outwitted or tricked far more often than they are just outright slain by a mighty hero in a stand-up fight.