{
    "id": "aether:iron_pendant",
    "modifiers": [
      {
        "type": "append",
        "attribute": "minecraft:generic.armor",
        "value": 3,
        "operation": "ADDITION",
        "uuid": "5278c6cd-f58b-4f88-83d8-bafa8a5a9ca7"
      }
    ],
    "equipment_slot": "necklace"
  }