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|Title||<Servant of the Lich King>|
Duke Vallenhal took the place of Orbaz Bloodbane who was at the Ruby Dragonshrine at some early point in the alpha/beta. Presumably, this was changed so Bloodbane could have a bigger role in Icecrown.
His last name might be a reference to Valhalla, the last resting place for dead vikings, or possibly to 80's rock band Van Halen.