Diablo 4 isn't "intended to be played forever" and there's a "pinnacle boss encounter" at the end

DIablo 4's Inarius close to smiting down a foe

Diablo 4's Nightmare dungeons will scale beyond level 100, but Blizzard says there's something of a final boss encounter that's designed to be your character's capstone.

In a group interview GamesRadar+ attended, associate game director Joe Piepiora confirmed that Nightmare dungeons will keep getting more challenging even past level 100, but there is a limit to the game's difficulty. Piepiora said Diablo 4 wasn't designed to endlessly scale with your character and that you'll eventually face a "pinnacle boss encounter" that'll test the limits of even the best level 100 builds.