Riot Block MC is a non OP prison server that mixes classic mine and grind with a big cave adventure.
There is a place called the Wardens Lair and it is a huge cave system full of mobs. When you beat them they drop cash so it feels like fighting and grinding at the same time. If you keep exploring you can find hidden dungeons with unique loot and valuable rewards.
If you just want the normal prison loop it has a clean progression system plus dozens of custom enchants. It also runs regular community events and the weekend event is live. It supports 1.21+.
