Dwarven Furnace
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Dwarven Furnace
Also called the Advanced Furnace. This ancient dwarven smelter runs on heat. At a normal furnace, coal is an ingredient in Steel and Mithril bars. Here you burn fuel to heat the furnace instead, and each bar only needs its ore once the furnace is hot enough. It is also the only place to smelt Ebony Bars.
Where to find it
In the old dwarven mine in the cavern, next to the Copperfield brothers (Galen, Garrett and Gideon). It has two parts: a fuel intake, where you add fuel, and an ore intake, where you smelt.
Crafting recipes
How heat works
Every piece of fuel adds the same amount of heat, but the hotter the furnace gets, the faster it cools down. At Ebony heat (2500) it loses heat about three times faster than at Steel heat (1400), so holding it hot enough for Ebony burns through much more fuel.
| Temperature | Cooling speed | Needed for | |
|---|---|---|---|
| 20 | 0.1x | ||
| 1400 | 1.6x |  | Steel Bar |
| 1800 | 2.5x |  | Mithril Bar |
| 2500 | 5.3x |  | Ebony Bar |
Cooling speed compares how fast the furnace loses heat at each temperature. The game files don't give the base rate in seconds.
Fuel
Essence Infused Coal counts as double fuel, so it burns twice as long as regular coal. Make it at a Reduction station from 1 Coal Ore (or Coal Dust) and 2 Essence. It needs Potion Making 45.
| Fuel | Fuel value | |
|---|---|---|
 | Coal Dust | Standard (exact value not in game files) |
 | Coal Ore | Standard (exact value not in game files) |
 | Essence Infused Coal | 2 |
Not confirmed yet
We know each fuel's heating power (10) and how much faster the furnace cools as it heats up. The game files don't include the base cooling rate, the starting temperature or how long one coal burns. The game sets those in its code. If you time it in game, let us know and we'll add it here.