Metallurgy

 Metallurgy is the Proficiency specialization of Bats. It grants them a 10% chance to produce twice the amount of resources when working in the following buildings:

•  Cooperage
•  Flawless Cooperage
•  Finesmith
•  Furnace
•  Mine
•  Rainpunk Foundry
•  Smelter
•  Flawless Smelter
•  Smithy
•  Stamping Mill
•  Tinkerer