create-the-brass-oncerto/config/iceandfire/hydra_cave_biomes.json

{
  "biomes": [
    [
      {
        "type": "BIOME_TAG",
        "negate": false,
        "value": "minecraft:is_overworld"
      },
      {
        "type": "BIOME_TAG",
        "negate": false,
        "value": "forge:is_swamp"
      }
    ],
    [
      {
        "type": "REGISTRY_NAME",
        "negate": false,
        "value": "terralith:orchid_swamp"
      }
    ],
    [
      {
        "type": "REGISTRY_NAME",
        "negate": false,
        "value": "byg:crag_gardens"
      }
    ],
    [
      {
        "type": "REGISTRY_NAME",
        "negate": false,
        "value": "byg:cypress_swamplands"
      }
    ],
    [
      {
        "type": "REGISTRY_NAME",
        "negate": false,
        "value": "byg:bayou"
      }
    ]
  ]
}