[
  {
    "id": "mass_grave_casings",
    "type": "item_group",
    "items": [ [ "223_casing", 60 ], [ "308_casing", 20 ], [ "shot_hull", 20 ] ]
  },
  {
    "type": "mapgen",
    "method": "json",
    "update_mapgen_id": "mx_mass_grave",
    "object": {
      "rows": [
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      ],
      "terrain": { "a": [ "t_pit_corpsed" ], "b": [ "t_fence_post" ], "c": [ "t_fence_barbed" ] },
      "furniture": {  },
      "place_loot": [
        { "group": "everyday_corpse", "x": [ 4, 4 ], "y": [ 8, 8 ] },
        { "group": "everyday_corpse", "chance": 100, "repeat": [ 1 ], "x": [ 4, 4 ], "y": [ 10, 10 ] },
        { "group": "everyday_corpse", "chance": 100, "repeat": [ 1 ], "x": [ 4, 4 ], "y": [ 13, 13 ] },
        { "group": "everyday_corpse", "chance": 100, "repeat": [ 1 ], "x": [ 4, 4 ], "y": [ 15, 15 ] },
        { "group": "mass_grave_casings", "repeat": [ 10, 15 ], "x": [ 1, 2 ], "y": [ 8, 15 ] }
      ],
      "place_monsters": [
        { "monster": "GROUP_VANILLA", "density": 1, "x": [ 1, 22 ], "y": [ 1, 22 ] },
        { "monster": "GROUP_SCHOOL", "chance": 35, "density": 1, "x": [ 1, 22 ], "y": [ 1, 22 ] }
      ],
      "place_fields": [
        { "field": "fd_blood", "x": [ 3, 4 ], "y": [ 7, 15 ], "repeat": [ 8, 12 ] },
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        { "field": "fd_blood", "x": [ 3, 4 ], "y": [ 7, 15 ], "repeat": [ 4, 8 ] }
      ]
    }
  }
]
