Produced by
Heals nearby units.
Within 5 tiles of Town Center, Keep, Town Center
Siege Directive
A focus on upcoming siege warfare is needed, siege weapons gain +20% bonus damage values and are field-constructed +50% faster.
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.
Madrasa
Siege Works: New carpentry techniques increase the health of siege units by +20%.
Siege Workshop
Greased Axles: Increase the movement speed of siege engines by +15%.
Geometry: Increase damage of Trebuchets by +20%.