Wraith

Wraiths are Undead.

Wraiths return in Diablo III, and while their function looks about the same, their graphics have been substantially improved. They were seen emerging from Ghostly Orbs in the WWI 2008 movie, and it's not known if they can only come from those odd monster generators, or if they'll be found roaming (floating) freely in the dungeons as well.

Wraiths have a melee slashing attack, and a ranged life drain attack as well. That one has a lovely graphic, with a swirling stream of blueish vapor flowing from the character to the Wraith. Characters under such an attack suffer a substantial penalty to their movement speed.