This item drops from Golemagg the Incinerator in the Molten Core.
If you speak to Lokhtos Darkbargainer while this item is in your inventory, he will offer you  A Binding Contract, which in exchange for the ingot gets you the [Plans: Sulfuron Hammer]. Along with many other items, eight more Sulfuron Ingots are needed to make the Sulfuron Hammer.
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