In my Tolkien ultimate-mega-reading list (I actually added two more books about him to study, bringing the number of books up to over a hundred, give or take - the whole
History of Middle-earth is for these purposes just
one book, btw), just today I finished
Finn and Hengest.
In case you didn't know, it's a collection of essays on the
Finnesburg Fragment and the respective short and vague episode in Beowulf concerned with the same matter (lines 1068–1158), a textual and translation commentary, trying to make sense of it, reconstructing what probably happened, philological and historical argumentation for the nationalities and genealogies of the actors; in fact there's a huge list of named characters with various degrees of depth on their identity, allegiance, ancestors.
A lot of it does not really require a knowledge of Old English
per se, but a lack thereof makes it significantly harder.
Let me just say that I
did study both law and theology at the university, I read Sartre and Heidegger and just recently I have read 3000 pages about the history of Czech Catholic literature in the past 150 years...
...and yet this was probably the most
hardcore stuff I have ever read. At times I thought my head is going to crack open.
It was fascinating and in many ways often interesting, but... like I said, utterly hardcore.
And as for the Tolkien experience, this is going to be probably the only book that even a truly fanatical fan of Tolkien isn't going to truly enjoy in the slightest - I mean, I find
most of this stuff rather interesting, 1. I am insane, 2. even then, going so deep on something so obscure in such a way... was a bit of a chore.
The only people here I can (vaguely) imagine of being interested in ... well, probably not precisely
reading it, but at least getting acquainted with it might be
@Perun and ... dunno,
@Brigantium ? (though geographically it's way too far from the lass' Northumbrian home).
But as an experience, it was definitely unique.