Warhammer End Of Times Books. V 3 s 3 p o f n s o r d e d z b 1 4 8 r. If you want something with more of a story, i recommend the gotrek & felix stories (quite old, so some stuff has been retconned or adjusted) the genevieve series (which also suffers from retconning, but includes really great stories like beasts in velvet), and the brunner the bounty hunter collection.
As a tt player of both 40k and wh fantasy since the eighties the age of sigmar end times represented decades of lore wiped out in a thinly veiled money grab that destroyed what made wh fantasy special. The end times #background & rules vol.iii book series by multiple authors includes books the return of nagash, the fall of altdorf, the curse of khaine, and several more. They made a fantasy based 40k clone.that is why long time fans hate it so much.
The warhammer fantasy roleplaying 2nd edition sourcebooks have a ton of lore.
I enjoy a fair amount of warhammer 40k fiction, and am currently enjoying early age of sigmar fiction. In the warhammer fantasy fluff, i'd definitely recommend the end times series, the tyrion and teclis trilogy and archaon: S p o c m n g s m o r e 4 q d 4 z g c. Warhammer the end times thanquol books.