Blacksmithing

You use a foundry with a crucible and an ingot mould to refine metals. Roll a Check against the material’s Forging Difficulty. On a success, you refine the metal. It loses weight according to its description. On a failure, you lose half of the ore’s weight but do not manage to refine it. When you roll only Misses, all material is lost.
You can refine 100g of material each time.

You use a forge, a hammer and an anvil to create a melee weapon out of steel. Roll a Check to determine the weapon’s quality. One or two Hits create a poor (-1) weapon, three or four make a mundane weapon, while five or six (or higher) create an exquisite (+1) weapon. If six Critical Hits are rolled, the item becomes masterwork (+2).
Note that some weapons require additional components, like wooden handles or leather straps. These must then be combined using the Crafting Proficiency.

You use a forge, a hammer and an anvil to create a set of chainmail or plate armour out of steel. Roll a Check to determine the armour’s quality. One or two Hits create a poor (-1) set, three or four make a mundane set, while five or six (or higher) create an exquisite (+1) set. If six Critical Hits are rolled, the item becomes masterwork (+2).

You can use a tool or stone to repair a damaged or chipped weapon you carry in order to restore its condition. Using a tool such as a whetstone (or just a wet flat stone, though this will give a -1 Disadvantage). You cannot use this to fix a blade that has been broken completely.

Using up a whetstone and sanding paper, you can increase a poor weapon to a mundane one, or a mundane one into an exquisite one. Roll a Blacksmithing Check. You need 3 Hits to make a poor weapon mundane and 5 to make a mundane weapon exquisite. The whetstone and sanding paper are rendered unusable regardless of your success. Weapons cannot be improved to masterwork quality.