In silverpine in cataclysm we learn that the forsaken are unable to raise anything that is human (and maybe high elves?) through a few quests, however what I am now wondering is how is there deathknights that are dwarves, gnomes, night elves, and such. Are they really dead? I can't remember having them actually being called undead except when Thaurissian saying they are all brothers are in death, I am likely wrong on that point however for it has been a while.