Allows character to refine 1 Iron Ore into 1 Iron using 1 Mini-Furnace. Skill value is (40+5*SkillLV)%. JobLV, DEX and LUK (in this order) further increase this chance.
Forging formula:
Success chance in %: Skill Value + JobLV * 0.2 + DEX * 0.1 + LUK * 0.1

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Enables the tempering of 1 Iron with 1 Iron Ore and 1 Mini Furnace.
The success rate increases with the skill level.
DEX and LUK further increases the success rate.