The Reserve is one of the government buildings, but is under the "Military Buildings" section.

  • This is a place where you can safely store your resources. If you are attacked, the resources in your Imperial reserve will stay invisible to the attacker. Keep as much as possible resources in your Imperial Reserve because they are safe there.

    -Base capacity: 2000 resource.
    -Each level after that adds 10% more capacity than the previous.-Maximum levels:10 for province 8