Back home we call them the Fade, or Myrddraal, these are similar but not full Shadowspawn, from what I can tell.
Moiraine and I fought two this morning, beheading worked to kill them and they remained dead. They have large teeth and no eyes, but seem to track easily enough without that. I have a few distinctive markers I've picked up for tracking them in the forest, they leave a longer trail than most walking beasts.