The stars on a kingdom represent its Kingdom Power Level.
Kingdom Power provides the following bonuses:
| Level | Bonus |
| 0 (base) | +50 Gold per Day |
| 1 | Double Tribute Reward |
| 2 | +50 Gold per Day |
| 3 | Double Tribute Chance |
| 4 | +50 Gold per Day |
| 5 | Double Skill Bonus |
| 6 | +100 Gold per Day |
| 7 | Triple Tribute Reward |