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The What: A harpy is an ugly bird-woman, usually with the body of a bird of prey and the head of a woman. The term harpy comes from a Greek word meaning "to snatch," and harpies were known in mythology to harass their victims by snatching their food away from them, among other things. They are pretty cruel and vicious things.
How It Could Work In An Episode: I think playing up the whole "this creature kills by denying people food" thing could really work. Death by starvation, slow and deliberate? That would be pretty creepy.
The What: Medusa was one of three Gorgon sisters. Looking directly at her would cause you to turn to stone, and she's often depicted with snakes for hair. She was beheaded by Perseus, who used a mirrored shield, among other magical items, to defeat her.
How It Could Work In An Episode: Mirrors as a means to kill something supernatural? Shades of "Bloody Mary," one of the creepiest episodes the show has ever done. Turning people to stone might be too obvious and whatnot, so maybe instead of turning people to stone our modern Medusa just paralyzes them and then goes in for the kill. That could put one of the boys in a nicely perilous situation, one paralyzed while the other has to come to the rescue.
18. Black Shuck
The What: An English legend, Black Shuck is a large black dog with flaming eyes that are either red or green, depending on the story. Some stories say he's a death omen and if you see him, you or one of your relatives is going to die. Other stories say he just likes to terrorize his victims for a while and then leave them alone to live their lives. He was also in the Supernatural:Origins comic.
How It Could Work In An Episode: In case you missed it in the explanation part, giant black dog with flaming eyes. Awesome! It's like a hellhound but with the added bonus of being visible. We know Dean isn't exactly a fan of giant supernatural dogs, so plenty of angst potential with this monster. Plus, since Black Shuck is an English legend, Crowley could be involved somehow.