After Robb attended to his dying wife and with his mother looking on in horror, he's pierced with arrows before Bolton lances him sending regards from the Lannisters -- the harbingers of evil. The race for the Iron Throne gets smaller.
Tyrion: Let me give you some advice bastard. Never forget what you are. The rest of the world will not. Wear it like armor, and it can never be used to hurt you. Jon: What the hell do you know about being a bastard? Tyrion: All dwarfs are bastards in their father's eyes.