Field Guide uses datapacks to modify which biomes and loot drops appear on an entry's page. You can target base entities, or specific variants by appending #variant_id to the entry identifier.

• Biome Modifiers: data/<namespace>/fieldguide/biome_modifiers/<filename>.json
• Loot Modifiers: data/<namespace>/fieldguide/loot_modifiers/<filename>.json

Example: Targeting a Base Entry

{
  "additions": [
    {
      "entry": "minecraft:cow",
      "value": "minecraft:milk_bucket"
    }
  ]
}

Example: Disambiguating Entry Type

If a mod registers both a block and an entity with the same ID, you can use a type prefix (entity:, block:, or item:) to target one specifically.

{
  "additions": [
    {
      "entry": "entity:minecraft:zombie",
      "value": "minecraft:rotten_flesh"
    }
  ]
}

Example: Targeting Specific Variants

If you want to isolate specific biomes or drops to a specific variant (like a Desert Villager only showing the Desert biome), use the # symbol.

{
  "additions": [
    {
      "entry": "minecraft:villager#minecraft:desert",
      "value": "minecraft:desert"
    }
  ],
  "removals": [
    {
      "entry": "minecraft:villager#minecraft:desert",
      "value": "minecraft:plains"
    }
  ]
}