Battle cards - NFTs related to the PVP mode.
There are two types of Battle cards:
PVP Buildings - these NFTs are intended for the production of combat units. These include: Barracks, Shooting Range, and Warhouse.
PVP Units - these NFTs are produced in PVP buildings for in-game resources and take part in battles between users. They include: Warrior, Shooter, War Machine.
Barracks produce Warriors
Warhouse produce War Machines
Shooting Range produce Shooters