rsemcm/client/overrides/config/alexsmobs/skelewag_spawns.json

{
  "biomes": [
    [
      {
        "type": "BIOME_DICT",
        "negate": false,
        "value": "overworld"
      },
      {
        "type": "BIOME_DICT",
        "negate": false,
        "value": "ocean"
      },
      {
        "type": "BIOME_DICT",
        "negate": true,
        "value": "cold"
      }
    ]
  ]
}