AdvanceChanged this version
Putrefaction Mill
By increasing the quantity of our boilers for the process of concentrating the Saltpeter and improving their reliability, we will be able to increase the production of gunpowder for our troops without the reliance on costly imports.
Cupola SmeltingAdvancerequiresAdvance tree
Definitionin_game/common/advances/1_building_unlocks.txt:544
546research_cost = -0.75