Let's focus on specializing our sub cities in building one troop type and gearing them towards that direction. Below are some suggested skill books and equipment refinements for different troop types.

For a sub city with a focus on ranged troops, consider the following build:

Skill Books:

Level 4 Ranged Troop Attack – Increases Ranged Attack by 25%

Level 4 Ranged Troop Range Bonus – Extends Ranged Troop Range by 100

Level 4 Ranged Troop HP – Boosts Ranged HP by 25%

Equipment Refines:

Bow – Increase Ranged Troop Attack % x4

Armor – Enhance Ranged Troop Defense % x4

Boots – Improve Ranged Troop Defense % x4

Helmet – Boost Ranged Troop HP % x4

Leg Armor – Strengthen Ranged Troop HP % x4

Ring – Raise Ranged Troop Attack % x4