You decipher the URL from the SSTV signal and visit the website, and your phone rings immediately. You answer, but before you even have time to say "hello," a voice speaks:

"I am thankful you found the cassette. I have been reaching through time and space, using multiple methods of communication in hopes to make contact, going so far as to leave behind a codex at some time during the 15th century. It was my desire for its secrets to be unlocked, but alas, that has yet to occur.

Maybe you can help, and finally free me.

But something is ... engulfing my surroundings. Not the naiads; that is simply visual metaphor. It’s some type of being or force I cannot explain, especially as words become more difficult the longer I am in this place.

Please tell me what language this is, what is engulfing my surroundings, and something on this page that doesn't belong."

https://www.themodernrogue.com/[language]-[the thing engulfing]-[what doesn't belong]