@Denalz Most tribes speak variants of the 'STANDARDISED UNNAMED LANGUAGE', but some to the much farther north might speak completely different languages. Dawn too speaks its own variant of the STANDARDISED UNNAMED LANGUAGE. The only other language I can make up off the top of my head is 'lingua', which is spoken in many countries to the far south and is the language used in the original versions of the The Word of Light.
Feel free to make up a name for that language, and make up some other ones :P
How about this: the common tongue as mentioned is.. more or less, the common tongue (haha.)
Then you have upper class speech, which is probably Dawnish. Even Vasili noblemen speak this language because, well, it's prestigious and it reflects well on your status. See it as the Latin or French of Europe. Why Dawnish? Because they seem more noble-like, where as the Vasili mingle with nordic tribes.
Besides that, you have tribal speech, which is subdivided into.. over a hundred different dialects as each tribe speaks it's own dialect, and has certain words that the other tribes only know if they've met this tribe in a friendly manner.
Further south you have many more languages, mainly used in trading, where they speak a mangled version of the common tongue, mixed with some of their native language. Ofcourse, this goes paired with lots of hand gestures which, over the years have also formed 'words' so you can use your hands to say words. For instance, if I wave at you and then pinch my nose, that means 'I want to buy sugar from you' for example. That's a dumb example, but it gets my point across.
Would that make sense? Just an idea that I came up with because, in England they spoke French as well because it was seen as a better, more noble language. It makes sense for us to have a similar situation.
I also wanna ask what the currency is in Vasili and what it's called?
I like Partisan's idea if it is acceptable to Kyle. I don't want Sarah to know a crazy amount of languages as her main prowess is is medicine. However, I think it reasonable and likely that she would know the original language of The Word of Light since she is educated and this is such a big part of her life. Of course she would also be familiar with the dialects around the Titus area and villages south of there as she has spent the past three years traveling those areas. Although it's doubtful that she would be familiar with dialects North of Titus as she has never been that far north. I'll have to think of a name for these languages.