there was a subscribtion service, which was 80, then later 100 books from the warhammer world. its meant to be the best books from the setting

most are stand alone, theres a few trilogies in it.

i made a list here of the first 80. im sure i added the other 20 tho

https://www.reddit.com/r/Warhammer40k/comments/d8b5ra/the_warhammer_40k_legends_collection_has_finally/