{
  "format_version": "1.8.0",
  "minecraft:spawn_rules": {
    "description": {
      "identifier": "addon:nightmare",
      "population_control": "monster"
    },
    "conditions": [
      {
        "minecraft:spawns_on_surface": {},
        "minecraft:spawns_underground": {},
        "minecraft:brightness_filter": {
          "min": 0,
          "max": 0,
          "adjust_for_weather": true
        },
        "minecraft:difficulty_filter": {
          "min": "easy",
          "max": "hard"
        },
        "minecraft:weight": {
          "default": 1
        },
        "minecraft:biome_filter": {
          "test": "has_biome_tag", "operator":"==", "value": "desert"
        }
      }
    ]
  }
}