LegendQuest: CrawlSpace

The first full release: Minecraft 1.21.11, 26.1.2, 26.2 and 26.3 on NeoForge, and now 1.20.1 on Forge 47.4 or newer. On 26.3, NeoForge 26.3.0.58-beta or newer. On 1.20.1, which has no mob scaling, bosses and their packs are normal size and the gelatinous cube steps rather than glides. Optional: LegendQuest 2.10.0 or newer, for your character's own checks.

Dungeons generated by 0.2.0 are left as ordinary blocks: new dungeons generate in new chunks.

Objective rooms. Big set pieces with a job: the Fighting Pit, the Firechasm (a crumbling bridge over lava, and a dragon), the Fountain of Light, the Tomb Chamber and the Idol Chamber, two jobs each. Guards from the level below, a reward chest, replay tablets, and a way back to the surface built into the room.

Coming back. Every 12 real hours a dungeon restocks: rooms, traps and chests fill again, and broken chests and doors are mended. Replay tablets wake one again, harder, with a boon and a bane for everyone in it.

The bottom. Seals won from each level's lair or puzzle are set on the finale's altar, with gold, to wake the deepest boss; beaten, it can be called back stronger.

More in the dungeon:

• Sleeping guardians to sneak past, prisoners to free, false lairs with the real one behind a secret wall
• Survival rooms, numbered guards, sentries with alarm horns, mimics, and the gelatinous cube
• Puzzle rooms on nearly every level: mazes, ice boards crossed in one go, teleport mazes; a solved one blesses you
• Vaults (take only one), token vaults, portcullises and keys, one-way doors, the thing you should not touch
• Many more traps, with tells; door previews; level feelings; the dungeon clock; elite champions
• The walls cannot be dug round; spawners burn out; dungeon spawners ignore light
• Objective rooms, shrines, rumour books, and Lootr support

For operators: /crawlspace showcase builds one of everything, /crawlspace devshowcase every objective room in a row, /crawlspace info full lists everything on every level, and /crawlspace gotodoor stands you outside a room.

The full list is in the changelog on GitHub.