Common - A "universal" language. Technically not a full language, instead comprised of choice words and syntax in order to easily bridge a language barrier. Known to all.
Parallel: Esperanto
Dominion - The language spoken in the Three Kingdoms. Other nations tend to have loan words or phrases from this language, as its word structures are typically governed by a strict set of rules that make the language relatively easy to learn. Unfortunately, what complicates things was the rise of regional dialects.
Parallel: European Languages - French/Spanish in Senesia, Latin in Sangeria, English in Dortet
Proto-Dominion - This language is spoken by inhabitants of the Frigid Mountains. It is thought to be where Dortetian is derived from, given that Dortet's language is strikingly different from the other two Kingdoms'. Few scholars have bothered to compile a language guide, as each tribe has their own dialect, not to the point of designating a separate language but definitely to the point of being difficult to understand every tribe.
Parallel: German
Sadahn - Developed in the great plains, it has a wide variety of dialects that make it difficult to learn according to which teacher you have. The writing, however, is notable for being seen as exquisite, borderline artistic.
Parallel: Arabic
Dionese - Remarkably similar to Dominion, yet different enough to still cause some amount of confusion, Dionese is considered a distant off-shoot of their protolanguages. Strangely they have completely different writing styles.
Parallel: Greek
Adrarian - The Adrarian language is notable for utilizing practically every muscle in the mouth as well as various clicking noises. This makes it remarkably hard to understand, however given enough time most are able to identify words not by their sounds but by the shape of their mouths while they speak.
Parallel: Bantu languages
Tagantan - An extremely rough language, it's relatively common to compare the various words in other languages to Tagantan's harsh and elongated words. So different is Tagantan from other languages in Ozel, that it's considered the hardest to learn, and the language itself has had a "downsizing" of sorts to cope with the mingling over generations.
Parallel: Hungarian