Please note that some information on this wiki is still based on the demo version.
If you notice any errors, feel free to correct them.
Kingdom Level
From Super Fantasy Kingdom Official Wiki
Kingdom Level is earned by. Kingdom Level allows expanding your kingdom. Using Kingdom Level will not spend it.
Acquiring
You earn 1 Kingdom Level if you used a new Unit, Siege Engine or 
Relic.
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Uses
Kingdom Level is used to expand your kingdom by building 
Roads. Unlocked Roads persist between cycles and play an important role in the global progression.
See Human Kingdom for details on which Roads you can unlock.
Source
Depletable
Game Mechanics
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