What’s a good gift idea to give to my boyfriend (26m) who’s a huge fan of LoTR?

I want to get him something that he’ll absolutely love but I’m not a big fan of LoTR. He’s already got a ring with some language on it that glows in the dark?? I would like to gift him something along those lines 😅

Edit: thank you all for the suggestions! All really great stuff. ☺️