Boredom-combat-server / MultiMC Server instance / Modded Server 1.16.5 / .minecraft / config / iceandfire / hippogryph_gray_biomes.json

{
  "biomes": [
    [
      {
        "type": "BIOME_DICT",
        "negate": false,
        "value": "overworld"
      },
      {
        "type": "REGISTRY_NAME",
        "negate": false,
        "value": "minecraft:dark_forest_hills"
      }
    ]
  ]
}