New Language: Elvish
Seeing that High Valyrian from Game of Thrones is being taught here in duolingo, it is only fitting enough to teach elvish as well (specifically sindarin). Elvish is not only a beautiful language, but a historical one as well. It has touched the minds and the hearts of people all over the world. From Tolkien scholars to fans of his works. The amazing world of Tolkien has such a huge fanbase that would be willing to help people from all over the world learn and appreciate elvish (sindarin).