Furnace

Furnace upgrades in your Stronghold are available from player level 3.

Requires Forging level 20 to build.

Crafting

Image	Recipe	Produces	Items required	Building level	Crafting time
	Smelt Iron Ore	1 × Iron Bar	2 × Iron Ore	1	10 seconds
	Forge Nails	10 × Nails	1 × Iron Bar	2	1 minute
	Burn Coal	1 × Coal	2 × Logs	3	1 minute
	Smelt Scrap	1 × Iron Bar	10 × Scrap	4	1 minute
	Forge Lockpicks	5 × Lockpick	10 × Iron Bar	5	1 minute
	Smelt Steel	1 × Steel	2 × Iron Bar; 1 × Coal	6	10 seconds
	Smelt Silicon	1 × Silicon	2 × Quartz; 1 × Coal	7	1 minute

Blueprints that must be found

Image	Recipe	Produces	Items required	Skills required	Building level	Crafting time
	Major Crafting Steel Mask	1 × Steel Mask	75 × Silicon; 500 × Steel	Forging level 75	7	1 minute
	Major Lucky Steel Mask	1 × Steel Mask	100 × Silicon; 1,500 × Steel	Forging level 90	7	1 minute
	Major Mining Steel Mask	1 × Steel Mask	45 × Silicon; 450 × Steel	Forging level 75	7	1 minute
	Minor Crafting Steel Mask	1 × Steel Mask	75 × Silicon; 350 × Steel	Forging level 50	7	1 minute
	Minor Lucky Steel Mask	1 × Steel Mask	150 × Silicon; 750 × Steel	Forging level 75	7	1 minute
	Minor Mining Steel Mask	1 × Steel Mask	50 × Silicon; 250 × Steel	Forging level 50	7	1 minute

Upgrades

Upgrade	Items required	Cash cost
Build Furnace	10 × Logs	$0
Furnace Upgrade 2	25 × Logs; 15 × Iron Bar	$100
Furnace Upgrade 3	50 × Planks; 50 × Nails	$250
Furnace Upgrade 4	50 × Planks; 20 × Nails	$1,000
Furnace Upgrade 5	100 × Planks; 60 × Nails	$2,500
Furnace Upgrade 6	140 × Planks; 85 × Nails	$5,000
Furnace Upgrade 7	190 × Planks; 110 × Nails	$7,500
Furnace Upgrade 8	250 × Planks; 250 × Nails	$10,000
Furnace Upgrade 9	500 × Planks; 100 × Nails; 100 × Iron Bar	$12,500
Furnace Upgrade 10	1,000 × Planks; 300 × Nails	$15,000