This mods turns the existing Copper bonus resource into a strategic resource. It also adds the Axemen unit, which has +5 combat strenght versus melee units. It has a vulnerability of -10 combat strenght versus light and heavy cavalry. The Axemen requires Copper to be built.
It also changes the upgrade path of the Warrior to the Axemen. Axemen upgrade to Musketmen. They provide an alternative way besides Swordsmen. This means there is no unit that upgrades to Swordsmen anymore.
Check here for more information on creating a unit mod:
https://donald23.nl/2017/03/10/mix-match-with-civilization-6-art/
It also changes the upgrade path of the Warrior to the Axemen. Axemen upgrade to Musketmen. They provide an alternative way besides Swordsmen. This means there is no unit that upgrades to Swordsmen anymore.
Check here for more information on creating a unit mod:
https://donald23.nl/2017/03/10/mix-match-with-civilization-6-art/