Grimghast

Whether enthralled or having failed to become liches, grimghast are the product of warrior-mages who are both spellweavers and spellswords who have joined the ranks of the undead. These rare undead seem to walk ordinarily, but then a dull teal glow appears and they "leap" off of one leg, into the air, and float for a few steps before repeating the process. They do not see, but they furiously hunt the living, they do not speak, and they do not negotiate.