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

{
  "biomes": [
    [
      {
        "type": "REGISTRY_NAME",
        "negate": false,
        "value": "minecraft:windswept_forest"
      }
    ],
    [
      {
        "type": "REGISTRY_NAME",
        "negate": false,
        "value": "minecraft:windswept_hills"
      }
    ],
    [
      {
        "type": "REGISTRY_NAME",
        "negate": false,
        "value": "terralith:windswept_spires"
      }
    ]
  ]
}