Metallurgy

Saltpeter

The Hwach'a replaces the cannon as the siege weapon of choice for the Korean civilization in the Middle Ages. The Hwach'a is a more advanced artillery unit, capable of bombarding adjacent targets. Hwach'a have no attack or defense value, so they should be protected by an escort. Further, they are wheeled units, so they cannot enter mountain, volcano, jungle or marsh terrain unless following a road. The Hwach'a has both Lethal Sea and Land Bombardment. A city must have saltpeter in its Strategic Resource to build a Hwach'a.