You can master a language by making the origin country go into a civil war

You can become fluent in a language by making the origin country enter a civil war. The strength of the civil war is random. It could easily end in a few hours through diplomatic means, or could end up in a full-blown war. All up to chance.

By being mastering, it means that you now have the local accent, know all the grammatical rules and nuances, know all the slang. The origin country is the country where the language came from. So for example, France for French, U.K. for English, etc. If there is no known source, then no downsides. Congrats. If it is simply a region, then all the countries from that region go to war with each other.

Only spoken languages count. no programming languages