Ancient Era
Classical Era
Renaissance Era
Industrial Era
Modern Era
Atomic Era
Information Era
Future Era
Military Engineering
Traits
Era
Medieval Era
Science Cost
700 [ICON_SCIENCE] Science
Eureka
Own 2 Catapults.
Unlocks
Trebuchet
Armory
Fort
Grand Citadel
Domrey
Hui Hui Pao
Tech Tree
Prerequires
Buttress
Metal Casting
Leads To
Printing
Gunpowder
Military Tactics
Language