{
  "condition": "minecraft:entity_properties",
  "entity": "this",
  "predicate": {
    "equipment": {
      "head": {
        "items": [
          "minecraft:leather_helmet"
        ],
        "count": {
          "min": 1
        },
        "nbt": "{manic:{id:\"nightmare_pendant\"}}"
      }
    }
  }
}
