... I didn't realize it was actually a language, honestly. *mildly embarrassed* I realized it had something to do with the Peverells, but...

I probably would've realized it was a language if I had thought it through a bit more (My mental model of Eliezer wouldn't throw in gibberish, and it can't be a code if "Peverlas" is so easily encoded), but then the chapter ended and I saw the Old English (which I did recognize, ironically.)