The Heimurinn Chronicles
Most of the languages of Heimurinn were influenced by the Ottari Tongue. Thus they have numerous similarities. But there are a few notable differences, mostly in pronunciation. For simplicity of explanation, these will be discussed from a purely out-of-game perspective.
Ottaridoma or Common, is a trade language spoken by most people of Cyfandir, Frynard, Eastern Svartkogur, Malnova, and Canoltyr