Ao andon or Aoando(Blue Latern) is a creature illustrated by Toriyama Sekien Toriyama Sekien in his Konjaku Hyakki Shūi. It was meant to represent the spirit that appeared during the game Hyakumonogatari Kaidankai, after the last story was told.The candles in the room during these meetings were often placed in blue-paper andon lamps in order to create an eerie atmosphere, hence this creature's name.

The ao andon is the incarnation of mass human terror, formed out of the built-up fears of large groups of people. This fear takes the appearance of a demonic woman with long black hair, blue skin, blackened teeth, sharp claws, and horns. It wears a white or blue kimono, and glows with an eerie blue light.

What exactly it does is a mystery; whether it slaughters all of the participants in a brutal finale inspired by the preceding tales, or simply jumps out to give one last shock before the guests return home has never been recorded. 

I was... messing around with this picture.

Don't hate me...