From the description:
It's after midnight, and you can hear ringing in your ears...
My submission for the FÖLK-LORE jam. No need to MÖRK-BORG-ify the gashadokuro from Japanese mythology. A fifteen-soldier-tall indestructible spirit, the gashadokuro should provide decent challenge for scvm that have survived a bit too long. Even the most seasoned scvm—mmm, seasoned scvm—will tire themselves out against the endless fury of the skeletal giant.
When the gashadokuro approaches, you will know it by the loud ringing in your ears and the gachi gachi of its chattering bones and teeth. It uses those teeth to decapitate victims before it drinks the spray of blood.
The only ways to trvly and permanently be rid of a gashadokuro are to find a way quench its anger or wait until its anger burns out.