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|Quality 1||+10% wall points|
|Quality 2||+20% wall points|
|Quality 3||+30% wall points|
|Quality 4||+40% wall points|
|Quality 5||+50% wall points|
Defense systems are needed in a region in order to improve the defensive value of that region. The value of the defense systems has decreased considerably, since populations and individual damage points increased.[?]
One:Wood is required to construct defense systems.