From what I'm hearing, that would be the entire death knight population. I overheard a group of them laughing about how you gave them the diary while they were disguised as couriers for the Scarlet Crusade when they were still part of the Scourge.
"... you people make my stomach turn with revulsion. That they would think to so brazenly violate the sanctity of my personal effects proves beyond all shadows of doubt that they are wretched creatures. Laugh at my most intimate revelations, did they!? Fine! Let them laugh! We shall see who's laughing when I tear the unbeating hearts from their chests!"











