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"The most powerful death knights within Naxxramas are the four horsemen. They represent the pinnacle of Kel'Thuzad's guard. The first, Thane Korth'azz, holds the power of flame. The next, Lady Blaumeux, calls forth the power of shadows, drawing the souls of the living into the voracious embrace. Sir Zeliek, a paladin in life, so strong in his faith, that even in undeath, the power of the light still heeds his call, smiting his foes in battle. Sir Zeliek still tries to make players run so he does not have to kill another person. The final death knight, Lord Mograine, was the finest warrior that the death knights had ever seen. However, after the events of Azeroth, he vanished without a trace. Kel'Thuzad has appointed Baron Rivendare in his place."
—Commander Eligor Dawnbringer