Humans that in death sought revenge on those around them. These creatures have a variety of "lesser" curses at there disposal, and can pass through solid objects at will. Demons can often be found haunting those that caused them grief in the past life, or in general attempting to drive people around them insane.

There are two ways of dealing with demons. One is to have a Yin-Yang master create a precinct at the location of one, this is however only temporary as the creature will most likely just move on. The second way is to give the Demon's human body a proper burial.