Smithy's Furnace is a FORGE, which is a type of furnace used for smelting and forging metals. It is used to heat metal to a temperature that is suitable for shaping with tools such as hammers and anvils. The heat from the furnace also helps to remove impurities from the metal, making it stronger and more durable. Smithy's Furnace is an important tool for blacksmiths and other metalworkers, allowing them to create strong and durable products.