Bone wraith



A bone wraith is a skeletal monstrosity fused together from the bones of the undead.

Notable

 * Lord Marrowgar
 * Earthrager Ptah

Speculation
At first it was believed, that the mighty Bone Wraiths are creations of the Lich King, since the only one known was fearsome Lord Marrowgar, however with recent resurfacing of Uldum and Halls of Origination it seems to be more of a "natural" occurence, like many other undead, as Earthrager Ptah cannot possibly be affiliated with Scourge in any way. It is also possible that it's just a coincidence, and more a technical and not a lore matter (read - model reuse) on Blizzard side.