Halls of Torment is Diablo cranked up to 50,000 kills/hour
The old-school Diablo games endure for a lot of reasons. Some players like the deep lore and world-building. Some like partnering with friends and working through dungeons as a team. Some like hunting for incredibly rare loot and maybe selling it on a livestream.
Sometimes, though, you dive into high-level Diablo just for a chance to kill a screen full of monsters really quickly.
If that kind of high-density enemy killing is what you're looking for, Halls of Torment's recent Version 1.0 release is a near-perfect take on the concept. Despite the decidedly old-school presentation, the game takes very modern inspiration from Vampire Survivors and its quick-hit bursts of leveling up through overwhelming enemy hordes. In doing so, it has become my absolute favorite way to wipe out enemies at rates approaching and exceeding 50,000/hour, at some points.