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+20 Difficulty against attacks from one named Village at a time.

Requirements

• 100,000 Ryo
• 1 of each Basic Resource¹ (for a total of 3)
• 2 Additional Primary Resources
• Village Size: 16

Comments

If there's one Village that's absolutely pounding your Village, this upgrade can help stop that. Just name that Village as the defense target, and there will be an increase in difficulty by 20 for them to attack your Village, a very viable deterrent in most cases. However, this can only be done against one Village at a time.

The invasion defense can be pointed towards non-existent villages. The system will not alert you when you enter the name of a village that does not exist.