Level 1
-4% upkeep costs for non-mercenary units
+1 cunning
Level 2
-5% non-mercenary unit recruitment cost
-8% upkeep costs for non-mercenary units
-4% construction costs
+2 cunning
Level 3
-10% non-mercenary unit recruitment cost
-12% upkeep costs for non-mercenary units
-6% construction costs
+3 cunning