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From Terraria Wiki
The Furnace is a crafting station used mainly to smelt ores into bars, to create ore bricks, and to craft Glass and certain glass items from Sand. It is also a light source. The Furnace smelts all pre-Hardmode ores besides Hellstone, which must be smelted in a Hellforge.
|| I'm Smelting! • "You have smelted 10,000 bars of metal!"
| Smelt 10,000 bars of metal.
- 1.2: Sprite updated, now needs 3 Torches to craft.
- Pre-Release: Introduced.