Wendigo

"The myth says that if you ate human flesh, your punishment was to turn into a creature that constantly craved it."

No mythological creature has fascinated me more then the Wendigo. Stemming from the Native Indian mythology, it's deemed an evil spirit, but it also acts as a cautionary tale, where if you consume human flesh, the very person who commits these acts will turn into an unrecognizable monster. 

I just love the sheer unstoppable power of the creature, pretty much resembling a terminator (In nature). 

So here you are;)