[
  {
    "type": "overmap_special",
    "id": "mutable_ruinfield",
    "subtype": "mutable",
    "locations": [ "land" ],
    "city_distance": [ 10, -1 ],
    "city_sizes": [ 0, 20 ],
    "occurrences": [ 0, 2 ],
    "check_for_locations": [
      [ [ 0, 0, 0 ], [ "land" ] ],
      [ [ 0, 1, 0 ], [ "land" ] ],
      [ [ 1, 0, 0 ], [ "land" ] ],
      [ [ 0, -1, 0 ], [ "land" ] ],
      [ [ -1, 0, 0 ], [ "land" ] ]
    ],
    "flags": [ "EXOPLANET" ],
    "joins": [ "ruin_to_ruin" ],
    "overmaps": {
      "ruin_core": {
        "overmap": "afs_formless_ruins_dynamic_north",
        "north": "ruin_to_ruin",
        "east": "ruin_to_ruin",
        "south": "ruin_to_ruin",
        "west": "ruin_to_ruin"
      },
      "ruin_line": { "overmap": "afs_formless_ruins_dynamic_north", "north": "ruin_to_ruin", "south": "ruin_to_ruin" },
      "ruin_termination": {
        "overmap": "afs_formless_ruins_dynamic_north",
        "north": { "id": "ruin_to_ruin", "type": "available" },
        "east": { "id": "ruin_to_ruin", "type": "available" },
        "south": { "id": "ruin_to_ruin", "type": "available" },
        "west": { "id": "ruin_to_ruin", "type": "available" }
      }
    },
    "root": "ruin_core",
    "phases": [
      [ { "overmap": "ruin_core", "max": 1 } ],
      [ { "overmap": "ruin_core", "max": 2 }, { "overmap": "ruin_line", "max": 10 } ],
      [ { "overmap": "ruin_core", "max": 5 }, { "overmap": "ruin_line", "max": 10 } ],
      [ { "overmap": "ruin_termination", "weight": 1000 } ]
    ]
  }
]
