All Blacksmiths can obtain this pattern. To receive the plans you must bring a single Sulfuron Ingot which drops from in Molten Core. You need to have an ingot in your inventory when you speak to him and you will be given a dialog option which leads to quest, that gives you the plans. Reputation is not needed to receive these plans, although you receive 4,000 reputation with the Thorium Brotherhood for completing this quest. The plans are not BoP.
- Now, before you actually craft the hammer, you will want to obtain an , which has an even lower drop percentage (from Ragnaros). Mats used to cost several thousand gold, but are now much cheaper since the release of several expansions. Combine the Sulfuron Hammer with the Eye of Sulfuras and you will get the legendary hammer, . If you know someone who can craft the hammer, it is advisable to pay them a fee, rather than using an Ingot, which is a rare drop.
Ragnaros wields a massive weapon named Sulfuras. It is far too massive for most mortals to even dream of wielding, even if they could somehow defeat the elemental Firelord. However, fanatical followers of Ragnaros found a way to craft hammers in its image. Each requires an eye of Sulfuras, and these lesser weapons are known as sulfuron hammers. A sulfuron hammer appears to be a smaller version of Sulfuras. It is a spiked, flaming red warhammer. The hammer is crafted entirely from elementium, with an eye of Sulfuras embedded deep in the hammer’s head.