Sulfuras, Hand of Ragnaros is the legendary hammer of the Fire Lord, Ragnaros. Until the release of Blackwing Lair in patch 1.6, it boasted the highest DPS of any melee weapon in the game.
Also, until [Might of Menethil] was added to the game with patch 1.11, it still maintained the highest raw damage in the game. Though the weapon has lost its damage supremacy, it is still widely seen as a status symbol.
Equipping the mace awards the Feat of Strength, Money achievement Sulfuras, Hand of Ragnaros.