Undead - W

Werewolf Ghosts = Hey, why not? If you want a ridiculous story, trying throwing one of these into your work. 
World Shadow = The World's Shadow is the ghostly reflection of our own within which dwells the spirits of the deceased and other incorporeal entities. For more info see World's Shadow. 
Wraith = Spirits of vengeance who seek out the blood of the guilty, these potent spirits are highly resistant to damage until the person they are after is finally brought to justice.