Ashbringer

History
 During the assault on Blackrock Spire in the Second War, Highlord Mograine of the Silver Hand claimed a mysterious dark crystal from a dead orc warlock. The crystal was the "living embodiment of shadow," and originated from Draenor.[4]  Upon touching it, Mograine's hand became tainted, his hand becoming like that of an undead's, which could not be healed.[5]

Mograine kept the crystal a secret until the first whispers of the Scourge reached Lordaeron. He revealed it to the other leaders of the Silver Hand, suggesting that they search for the crystal's polar opposite — a manifestation of the Light itself — to be used against the impending undead holocaust. Mograine's peers, appalled at the sight of this dark crystal, attempted to destroy it with a holy spell. Unexpectedly, the crystal absorbed the spell and became its antithesis, the very crystal of pure light that Mograine suggested moments before. It was decided that from this crystal a weapon would be forged that would smite the undead with such power that only a cloud of ash would remain in its wake — The Ashbringer

 Mograine and  Fairbanks  traveled to  Ironforge, where  King Magni Bronzebeard  forged the blade himself upon  The Great Anvil , infusing it with rage and vengeance for his brother  Muradin Bronzebeard  whom was believed to have fallen before  Frostmourne. King Magni is said to have claimed he had never before crafted such an extraordinary weapon, nor would he ever again.