With the Metallurgy skill, you are able to craft special metals which can be infused into weapons and armor. Each of these special metals will give a different effect depending on if it is used in a weapon or an armor. Items infused with special metals cost 25% more to upgrade than regular items. (For more info on cost of upgrades, see Cost of Upgrading Gear)
To infuse a weapon or armor with a special metal requires 3 bars of that metal. They are infused on a workshop inside your manor.
Note: When infusing your existing weapons with a special metal, the change is permanent. The process cannot be reversed or changed to a different special metal. Don't do this unless you are absolutely positive it is the special metal you want.
Types of Special Metals:
Item Quality and Metal Chance
When applying a Metal effect, the quality of the weapon and armor being used affect the Metal's chance to apply as a percentage multiplier.
The percentage formula is: ((10 + Quality1 - Quality2) / 10) * 100%