Wraiths
From BelegarthWiki
Wraiths are spirits brought out of the Astral Plane to the Material Plane and given physical forms via the use of a necromancer or Lich. Wraiths appear to be hooded specteral figures who's faces are unseen and who's physical form appears to be similar to a cloud of fog. Wraiths can only be killed via the use of an exercism, holy weapon, or items that can specifically kill non-corporeal beings or dark magiks.