Allows character to refine 5 Iron and 1 Coal into 1 Steel using a Mini-furnace. Skill value is (30+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 Steel with 5 Iron, 1 Coal and 1 Mini Furnace.
The success rate increases with the skill level.
DEX and LUK further increases the success rate.