This command adds the specified amount of fervor to the country with the specified country tag.
fervor [amount] [country tag] DLC: Wealth of Nations
|The amount of fervor you wish to add. Specify a negative number to remove.
|The tag of the country you wish to add or remove fervor from. Note that they should be of the Reformed religion (as otherwise there is no fervor to add or remove).
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The above command would add 6 fervor to your current country.
The above command would remove 6 fervor from your current country.
fervor 15 SPA
As we've specified Spain's country tag (SPA) in this command, 15 fervor would be added to Spain.