Duke Vallenhal is a level 73 human death knight found in Ruby Dragonshrine in Dragonblight. He is accompanied by Worn Bloodworms. His unholy energy needs to be drained for  In Service of Unholy.
- 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, but Bloodbane is still mentioned as having killed Dahlia Suntouch.
- 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.