My bad. You’re right.

Yes. Endgame consists of dungeons with harder and harder add-ons, world bosses, tree of whispers quests, and helltide events.

In Diablo, humans are always fodder for the Eternal Conflict. Even the main character that defeats the prime evils in one game is consumed/killed by the start of the next one. This is the way.

I suggest Skyrim if you want a good mix of stories and NPCs that actually go about a regular life in the world.