"This creature roams around forests and lonely streets, whistling very loudly. It is said that if anyone hears its whistle at least 7 times, the person who heard them will die pretty soon with no exception. An apparatus has been invented which can be placed on the mouth of this creature to make it stop whistling forever, however doing this makes the creature very angry and violent, making the act of placing the apparatus a human sacrifice..."

Came up with this concept and loved how it turned out. I'm naming this character "Nurec".