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Unlocked after raising the Trader's Square to level 5. The Engineering School serves as a training building for the Artificer and Alchemist workers, unlocking them at levels 1 and 21 respectively. The collective boost will provide a boost to the Tinkering skill while the building remains active. The instant boost will give experience points for the Engineering School workers.
Leveling up the building will permanently increase the maximum level of the related workers. Boosts will provide experience increases in the related crafting skills and to the related workers.