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The Spy and Cyber Ninja can infiltrate an enemy city and incite the citizens to revolt. If the attack is successful, the city forms a new empire. The Spy has a 25% chance of success, with a 50% chance of getting caught. The Cyber Ninja has a 35% chance of success, with a 25% chance of getting caught. If either unit is caught, they are killed.
This attack costs Gold to perform. The total cost of the attack depends on the size and Happiness of the city.