{
  "type": "minecraft:entity",
  "pools": [
    {
      "rolls": 1,
      "entries": [
        {
          "type": "minecraft:item",
          "name": "irons_spellbooks:decrepit_key",
          "conditions": [
            {
              "condition": "minecraft:killed_by_player"
            }
          ]
        }
      ]
    }
  ]
}