Wight

Wights are a type of undead resulting from infernal deals with those dead but
not yet moved on. Wights are a type of undead, their heart
does not beat and they have no need of normal food or drink, but otherwise
they seem almost completely human. They can even eat and drink if they’d
like without the problems vampires tend to have.

However their bodies need to be sustained with living human flesh,
mechanically this means that wights need to use the bite command on helpless
PCs fairly regularly, inflicting one level of wound, none to mild, mild to
severe etc. Those with regenerative powers offer significantly less
sustenance.

If Wights don’t feed often enough they will start to grow more corpselike,
with some of extremities beginning to show signs of rotting and the rot
slowly working its way in before finally making its way up to the face.
Shortly afterwards if the wight continues to slip they will die, a wight
that dies cannot return as a ghost.

The longer a wight exists, the more frequently it needs to feed, leading most
of them to succumb to decay sooner rather than later. Still, it’s the only
shot at a second chance of life that most ordinary people are going to get.