For an idea of what the Wraith looks like:
[img=http://fc00.deviantart.net/fs70/f/2013/029/a/2/lich_concept_by_firstkeeper-d5t80p1.jpg]

And here's the Dracolich:
[img=http://s.cghub.com/files/Image/147001-148000/147357/911_max.jpg]