[
  {
    "type": "item_group",
    "id": "ps_artifacts",
    "subtype": "distribution",
    "items": [
      [ "art_sphere", 100 ],
      [ "art_rod", 100 ],
      [ "art_teardrop", 100 ],
      [ "art_lamp", 100 ],
      [ "art_snake", 100 ],
      [ "art_disc", 100 ],
      [ "art_beads", 100 ],
      [ "art_napkin", 100 ],
      [ "art_urchin", 100 ],
      [ "art_jelly", 100 ],
      [ "art_spiral", 100 ],
      [ "art_pin", 100 ],
      [ "art_tube", 100 ],
      [ "art_pyramid", 100 ],
      [ "art_crystal", 100 ],
      [ "art_knot", 100 ],
      [ "art_crescent", 100 ]
    ]
  },
  {
    "type": "item_group",
    "id": "ps_artifact_weak",
    "subtype": "distribution",
    "entries": [
      {
        "group": "ps_artifacts",
        "artifact": {
          "procgen_id": "netherum_tunnels",
          "rules": { "power_level": 500, "max_attributes": 3, "max_negative_power": -750, "resonant": true }
        },
        "prob": 100
      }
    ]
  },
  {
    "type": "item_group",
    "id": "ps_artifact_medium",
    "subtype": "distribution",
    "entries": [
      {
        "group": "ps_artifacts",
        "artifact": {
          "procgen_id": "netherum_tunnels",
          "rules": { "power_level": 750, "max_attributes": 4, "max_negative_power": -1000, "resonant": true }
        },
        "prob": 100
      }
    ]
  },
  {
    "type": "item_group",
    "id": "ps_artifact_strong",
    "subtype": "distribution",
    "entries": [
      {
        "group": "ps_artifacts",
        "artifact": {
          "procgen_id": "netherum_tunnels",
          "rules": { "power_level": 1000, "max_attributes": 5, "max_negative_power": -1250, "resonant": true }
        },
        "prob": 100
      }
    ]
  }
]
