Unlock the basic Furnace by obtaining Copper Ore or Tin Ore, then build it with 24 Stone, 8 Clay, 4 Charcoal, 10 Fire Runes, and 8 Vault Shards. Place it without a roof overhead and supply Charcoal to smelt supported ores. If you want Steel or Mithril, you need the separate Blast Furnace, which unlocks when you first obtain Coal and uses Fuel Pellets instead.
A Furnace that exists in your base can still be unable to run. Check the station type, overhead roof, fuel, and recipe separately. Adding more ore will not fix a roof obstruction; putting Charcoal into your supply chest will not turn it into Blast Furnace fuel; and the basic Furnace does not gain the Steel recipe merely because you found Coal.
Unlock the correct station before collecting the building materials
The basic Furnace recipe becomes available after Copper Ore or Tin Ore enters your inventory. This is an item discovery requirement. Looking at an ore node or walking through an area that contains it is not the same as obtaining the ore.
If the build option is missing, confirm that you have picked up one of those materials. Do this before gathering the complete construction list, so that a locked recipe does not get confused with a shortage of Stone or Vault Shards.
The Blast Furnace has its own discovery trigger: obtaining Coal for the first time. It also has a different building cost and fuel supply. Progressing to it does not remove the usefulness of the basic Furnace, whose recipes still cover several ores and salvage types.
| Station | Discovery that unlocks it | Operating fuel | Placement condition |
|---|---|---|---|
| Furnace | Copper Ore or Tin Ore in inventory | Charcoal | No roof overhead |
| Blast Furnace | Coal obtained for the first time | Fuel Pellets | No roof overhead |
| Kiln | Clay in inventory | Processes wood into Charcoal | Can work indoors |
Gather the basic Furnace construction materials
| Material | Amount for one Furnace |
|---|---|
| Stone | 24 |
| Clay | 8 |
| Charcoal | 4 |
| Fire Rune | 10 |
| Vault Shard | 8 |
Gather the whole list before placing the station. Charcoal in this table is a construction ingredient, so keep additional Charcoal for operation. Spending your last four pieces on the build can leave the completed machine without a fuel reserve.
Vault Shards and Vault Cores are different materials. The basic Furnace needs eight Shards, while the Blast Furnace needs two Cores. Check the actual item names when preparing storage or moving materials to the build site. The presence of one vault material does not fulfill a requirement for the other.
Build the Furnace from the Material Processing collection. Choose a location that keeps the top clear while leaving its interaction point accessible. If your workshop has a continuous roof, use an uncovered area rather than placing the station beneath a decorative opening that still leaves a roof piece above it.
There is no need to dismantle every covered workstation to solve this. The important layout decision is which machine requires open sky. Your Kiln can operate indoors, while the two Furnace types need to remain uncovered.
Use a Kiln to establish the Charcoal supply
The Kiln turns wood resources into Charcoal. Its recipe unlocks after you receive Clay in your inventory, and one Kiln requires 8 Ash Logs, 20 Stone, 6 Clay, and 10 Fire Runes to build.
The Charcoal conversion accepts several wood types, including Ash, Oak, Willow, Blightwood, Maple, and Yew logs. Ash, Oak, and Yew planks also have listed Charcoal recipes. Each of these listed inputs produces one Charcoal from one wood item.
For a first Furnace, use the wood supply you can obtain comfortably. A later wood type is not required simply because it appears among the acceptable inputs. Keep wood intended for building projects separate from wood you are converting into fuel, especially if both are stored near the Kiln.
A practical first-smelting sequence is:
- Obtain Clay and unlock the Kiln.
- Build it and process a stock of wood into Charcoal.
- Reserve four Charcoal for the Furnace construction recipe.
- Obtain Copper Ore or Tin Ore to unlock the Furnace.
- Build the uncovered Furnace with the full construction list.
- Supply operating Charcoal and begin a supported metal recipe.
The Kiln processes materials slowly enough that you can leave it working while gathering other items. That supports a continuing fuel supply rather than stopping each ore trip to make just enough Charcoal for the next batch.
Match the ore to a basic Furnace recipe
The basic Furnace handles Bronze, Iron, Gold, Silver, and Blurite recipes. The amount of ore required depends on the metal. Select the recipe you want, then use its listed input rather than treating every three items as an interchangeable metal batch.
| Recipe | Materials | Output |
|---|---|---|
| Bronze from ore | 3 Copper Ore and 3 Tin Ore | 2 Bronze Bars |
| Bronze from salvage | 9 Bronze Salvage Pile | 1 Bronze Bar |
| Iron from ore | 3 Iron Ore | 1 Iron Bar |
| Iron from salvage | 9 Iron Salvage Pile | 1 Iron Bar |
| Gold from ore | 3 Gold Ore | 1 Gold Bar |
| Gold from salvage | 9 Gold Salvage Pile | 1 Gold Bar |
| Silver from ore | 3 Silver Ore | 1 Silver Bar |
| Silver from salvage | 9 Silver Salvage Pile | 1 Silver Bar |
| Blurite from ore | 3 Blurite Ore | 1 Blurite Bar |
The Bronze ore recipe is worth checking carefully because its output is two bars, while the listed Bronze salvage recipe produces one. If you are estimating the materials for a target quantity, base the calculation on the actual recipe you are using.
Salvage is an alternative input with its own recipe. A Bronze Salvage Pile does not replace Copper Ore in the mixed ore recipe; it belongs to the separate salvage conversion. Choose the correct entry when your inventory contains recovered salvage rather than mined ore.
Although the Furnace's description mentions firing Clay, the current station does not perform that function. Use the Kiln for supported fired Clay items. Repeatedly adding raw Clay to the Furnace will not reveal a missing pottery recipe.
Move to the Blast Furnace for higher-tier processing
The Blast Furnace expands your processing options. Its construction requires 12 Granite, 8 Iron Bars, 4 Draconic Leather, 10 Fire Runes, and 2 Vault Cores. As with the basic station, building materials and operating materials are separate costs.
Fuel Pellets are made at a Blacksmith's Bench by combining Charcoal, Adhesive, and Coarse Animal Fur. Coal is not a replacement for this fuel. In many Blast Furnace recipes, Coal is one of the materials processed into the final bar, while Fuel Pellets keep the machine operating.
| Blast Furnace goal | Recipe materials | Output |
|---|---|---|
| Steel from ore | 3 Iron Ore and 3 Coal | 1 Steel Bar |
| Steel from an existing bar | 1 Iron Bar and 3 Coal | 1 Steel Bar |
| Steel from salvage | 9 Steel Salvage Pile and 3 Coal | 1 Steel Bar |
| Mithril from ore | 3 Mithril Ore and 3 Coal | 1 Mithril Bar |
| Adamant | 3 Adamantite Ore and 3 Coal | 1 Adamant Bar |
| Black Metal from scraps | 6 Black Metal Scraps and 3 Coal | 1 Black Metal Bar |
| Rune | 3 Runite Ore and 3 Luminite Ore | 1 Rune Bar |
Other Blast Furnace recipes include Refined Obsidian, Molten Glass, and bar production from metal leaves. These are distinct conversions, rather than evidence that the Blast Furnace automatically duplicates every basic Furnace recipe.
Keep the basic machine available if it still serves your inputs. For example, the listed Gold Ore conversion is a Furnace recipe, while the Blast Furnace lists Gold Leaf conversion. The name of the final bar alone does not identify which station and input recipe you need.
Use Superheat after the production chain works
Superheat unlocks at level 20 Artisan. Cast it on a fire-based processing station to increase processing speed by 90% for 30 seconds. The supported stations include the Kiln, Furnace, and Blast Furnace, so it can help both fuel preparation and metal processing.
The spell accelerates the active machine. It does not replace missing recipe ingredients, supply fuel, or remove an overhead roof condition. First confirm that your station can operate normally; then use Superheat to shorten the waiting portion of a larger batch.
Choose the station that is delaying your immediate goal. If the Furnace is idle because you have no Charcoal, accelerating it achieves little. Help the Kiln produce fuel first. If the fuel reserve is ready and several metal batches remain, accelerate the Furnace instead.
This approach also helps with a chain involving both Furnace types. Smelt the required Iron Bars in the basic machine, then move the relevant inputs to the Blast Furnace. Apply the spell where the current batch is actually running, instead of assuming every nearby station receives the same effect.
Diagnose a Furnace that will not run
Start with the visible station and its menu. Confirm that it is the basic Furnace or the Blast Furnace you intended to use. Similar names can hide a recipe mismatch, especially when you arrive with Steel inputs at the basic machine.
Next inspect overhead construction. Both Furnace types require a clear space above them. The Kiln's ability to function indoors does not extend to either Furnace. If the problem began after expanding the workshop roof, check the new pieces before changing your recipe or gathering more fuel.
Then separate fuel from ingredients. The basic Furnace needs Charcoal for operation. The Blast Furnace needs Fuel Pellets, while Coal may belong to the selected recipe. Check quantities against that recipe and avoid moving construction ingredients into an operating-fuel plan by mistake.
Finally inspect the output you are trying to create. Clay firing belongs at the Kiln, higher-tier bars belong to the appropriate Blast Furnace conversion, and basic ore or salvage recipes belong to their listed station. Once the station, roof, fuel, and input all match, use Superheat if faster processing is the remaining objective.