{
  "parent": "sanguine:technical/root",
  "criteria": {
    "requirement": {
      "trigger": "minecraft:inventory_changed",
      "conditions": {
        "player": {
          "equipment": {
            "head": {
              "items": [
                "minecraft:leather_helmet"
              ],
              "nbt": "{sanguine:{id:\"butcher_skull\"}}"
            }
          }
        },
        "items": [
          {
            "items": [
              "minecraft:leather_helmet"
            ],
            "nbt": "{sanguine:{id:\"butcher_skull\"}}"
          }
        ]
      }
    }
  },
  "rewards": {
    "function": "sanguine:item/butcher_skull/equip"
  },
  "requirements": [
    [
      "requirement"
    ]
  ]
}
