I'm sure this is useful for something!
Naughty people get coal, but some are too naughty to deserve just that. Zombie Santa knows everything, and he has a very special present, straight from the depths of hell, exclusively for these naughty people. If you happen to find this in your stockings, make sure you put it to good use! Just don't let it come anywhere near a fire...
Can be made with the right materials or found in the stockings of extremely naughty survivors.