Produced by
Weapons
Siege RepairsRepairs nearby siege engines for 2 health every second.
Within 4.5 tiles of Machine Workshop
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Blacksmith
Military Academy: Increase the production speed of infantry, cavalry, siege, and transport units at buildings by 33%. Does not affect religious units or other support units.
Machine Workshop
Lightweight Frames: Increase the movement speed of siege engines by +10%.
Reinforced Axles: Further increase the movement speed of siege engines by another +10%.
University
Chemistry: Advancements in alchemical research increase the bonus damage of all gunpowder siege weapons by +25%.
Siege Works: New carpentry techniques increase the health of siege units by +20%.
