This quest is not available in game.
Bring a Galvanized Horn to Orm Stonehoof in Thunder Bluff.
I will make you the helm, but you must show me you are worthy of it.
Nestled in the southwestern reaches of the Stonetalon Mountains lies the Charred Vale. It was once a verdant place, but is now defiled and ashen, and what creatures remain there are mad with pain and despair.
That place is where I send you, <name>.
You must go to the Charred Vale and find a chimaera matriarch. Slay her, free her of her misery. Bring me her galvanized horn as proof, and I shall make for you the helm.