{
  "criteria": {
    "1": {
      "trigger": "player_killed_entity",
      "conditions": {
        "player": {
          "slots": {
            "container.*": {
              "predicates": {
                "minecraft:custom_data": "{colosseum_of_fools:{soul_item:1b}}"
              }
            }
          }
        }
      }
    }
  },
  "rewards": {
    "function": "colosseum_of_fools:player/soul/kill_entity"
  }
}