This quest is not available in game.
Craftsman Wilhelm at Light's Hope Chapel in the Eastern Plaguelands wants you to bring him 2 Frozen Runes, 2 Essence of Water, 2 Blue Sapphires and 30 gold pieces.
You fancy yourself a hero of the Dawn, eh? I've seen our greatest soldiers get rolled over by Kel'Thuzad's plebes! How well could someone so clueless possibly fare in Naxxramas?
Bah, what choice do I got? You're the best I can do; I may as well help you.
Omarion left me with one recipe. It's the only song I know... I can make a few variations of these pants; you just gotta supply the materials.