The Book of the New Sun is amazing simply for the language. I actually thought he was simply making up words until I got out a dictionary and discovered that his vocabulary simply far surpassed mine, and mine isn't terrible.
[1] https://www.amazon.com/Lexicon-Urthus-Dictionary-Urth-Cycle/...
A bit hard to explain, but not something I've experienced to the same degree outside of Wolfe.
His books are incredible and really pay off careful rereading.
I never read Gene Wolfe after I started reading in English, I've read him in my native language. I'll need to bump him up in my reading list to see how it reads in English.
He is talking about people and creatures and things that are far removed from our everyday experience in one direction (the remote future), and he is doing so through archaic words that are just as far removed in the opposite direction (the remote past).