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Unlocked after raising the Iron Mine to level 10. The Foundry serves as a resource generation building for the Steel resource. Leveling up the Foundry will permanently increase the hourly regeneration rate. Boosts will provide temporary increases in the regeneration rate as well as providing instant resource gains.
Boosts & Unlocks
Boosts provide various temporary benefits to your city, workers and heroes for each investment.
Raising a building's level will unlock various permanent perks for your city.