Are there video media (e.g TV shows, Movies, anime, video games, youtube videos, etc...) with a majority of the dialogue in an fictional language? - sh.itjust.works

You know how in fantasy worlds, its all english? Kinda breaks the immersion a bit. I wanna find something where they make it as realistic as possible, and make everything in a fictional language, basically using subtitles as the main way to understand the plot.