Datapacks

Datapacks

Almost everything the murk does to the world is data, so a datapack can change it without touching the config. The config lists only add to what datapacks define.

You want to…	Use	Page
Turn one block or item into another under the murk	fogged:murk_transform recipe	Datapack Murk Transforms
Make the murk remove, spare, douse or snuff a block	block tags	Datapack Tags
Let a mob live under the fog	entity tag	Datapack Tags
Turn off or override a built-in pack	pack list or override files	Datapack Built-in Packs
Change where karst towers generate	biome modifier and structure sets	Datapack Worldgen

Pack layout

my_pack/
├── pack.mcmeta
└── data/
    ├── my_pack/
    │   └── recipe/
    │       └── rust_iron_doors.json      ← murk transforms
    └── fogged/
        └── tags/
            ├── block/
            │   ├── scoured.json          ← add blocks the murk removes
            │   └── scour_immune.json     ← spare blocks
            └── entity_type/
                └── breathes_murk.json    ← mobs that live under the fog

pack.mcmeta for Minecraft 1.21.1:

{
  "pack": {
    "pack_format": 48,
    "description": "My murk tweaks"
  }
}

Installing

• New world: Create World → More → Data Packs, and drag the folder or zip in.
• Existing world: put it in saves/<world>/datapacks/, then run /reload.
• Server: put it in world/datapacks/, then run /reload.

Use /datapack list to check that the pack is enabled.

From a mod

A mod uses the same files, placed under src/main/resources/data/. Fogged doesn't need to be a dependency. If Fogged isn't installed, the recipe type and tags are simply never read. To keep the log clean in that case, guard recipes with a NeoForge mod_loaded condition:

"neoforge:conditions": [{ "type": "neoforge:mod_loaded", "modid": "fogged" }]