Last Epoch is close to this, it has full offline mode with a faction you can join that increases drop rates and allow for more target farming in exchange of not being able to trade, which in offline is not possible anyways
It definitely does not compare to the diablo i grew up with. I was able to play that single player and offline :\
HiroK@lemmy.world 1 day ago
NebulaNymph@programming.dev 1 day ago
Have you tried Grim Dawn? Definitely scratched the Diablo itch for me, and can fully be played offline (only way I have played it)