{
    "id": "simplemagnets:advancedmagnet",
    "modifiers": [
      {
        "type": "append",
        "attribute": "ars_nouveau:ars_nouveau.perk.mana_regen",
        "value": -0.2,
        "operation": "MULTIPLY_BASE",
        "uuid": "04233330-d224-478c-9747-445120b932c3"
      }
    ],
    "equipment_slot": "charm"
  }