{
  "entity": "WitherSkeleton",
  "modifiers": [
    {
      "type": "invisible"
    },
    {
      "type": "equipment",
      "hand": "IRON_SWORD",
      "helmet": "WITHER_SPECTRE_MONSTER",
      "chestplate": "LEATHER_CHESTPLATE#090608"
    }
  ] 
}