Ysoki is a family of closely related languages spoken by ratfolk across Kishar. While often considered a single language by non-ratfolk, in reality there is significant variation between Ysoki dialects, sometimes to the degree that they lose mutual intelligibility.
Ysoki has a number of noun classes that identify the level of familiarity the speaker or writer has with a subject noun, broadly defined as high familiarity, some familiarity, low familiarity, unfamiliarity, and no knowledge at all. For animate nouns, like people and animals, the use of these noun classes are relatively intuitive if varying by individual, but inanimate nouns are given fixed noun classes. For example, all water is very familiar, and all stones unfamiliar, even if those are not necessarily true for the speaker in question.