{
  "feature": "terralith:dark/fallen_dark_oak",
  "placement": [
    {
      "type": "minecraft:rarity_filter",
      "chance": 4
    },
    {
      "type": "minecraft:in_square"
    },
    {
      "type": "minecraft:heightmap",
      "heightmap": "MOTION_BLOCKING_NO_LEAVES"
    },
    {
      "type": "minecraft:block_predicate_filter",
      "predicate": {
        "type": "minecraft:matching_blocks",
        "blocks": [
          "minecraft:grass_block",
          "minecraft:podzol",
          "minecraft:dirt",
          "minecraft:coarse_dirt"
        ],
        "offset": [
          0,
          -1,
          0
        ]
      }
    },
    {
      "type": "minecraft:biome"
    }
  ]
}