Proto-Plains language
Proto-Plains is the proto-language that gave birth to the Dothraki and Lhazareen languages. The language is not fully developed, but there exists a method for deriving vocabulary for Lhazareen, and its grammar has been developed to some extent. Given the scope of the book and the television series, Peterson views it as unlikely that there would ever be a need for a full Lhazareen language. As conceived by Peterson, the language has vowel harmony and lateral fricatives. He has stated that he may one day flesh out Proto-Plains so that others can derive sister languages to Dothraki, or their own version of Lhazareen. However, this will not happen in the near future.