{
  "criteria": {
    "holding_bone": {
      "trigger": "minecraft:tick",
      "conditions": {
        "player": {
          "slots": {
            "weapon.mainhand": {
              "predicates": {
                "minecraft:custom_data": "{necromancer_calling_bone:1b}"
              }
            }
          }
        }
      }
    }
  },
  "rewards": {
    "function": "kiwi2:upgrades/classes/necromancer/summons/all_summons/spawn_call_interaction"
  }
}