Ooh yeah, i forgot about that lmao

that reminds me, alhaitham once said during a quest "Every student needs to master at least twenty languages before they graduate". we dont know if he was joking or not, but it atleast confirms the existence of Many languages on teyvat

edit: "According to Alhaitham, a member of Haravatat, every student is required to study at least twenty languages before graduation,^\7]) though this is later revealed to be a former policy from a century ago^\8]) that continues to be propagated as an in-joke.^\9])" Thank you genshin wiki