ServerEvents.highPriorityData(e => {
    e.addJson("minecraft:worldgen/biome/plains", 
        {
            "carvers": {
                "air": [
                    "minecraft:cave",
                    "minecraft:cave_extra_underground",
                    "minecraft:canyon"
                ]
            },
            "downfall": 0.4,
            "effects": {
                "fog_color": 12638463,
                "mood_sound": {
                    "block_search_extent": 8,
                    "offset": 2.0,
                    "sound": "minecraft:ambient.cave",
                    "tick_delay": 6000
                },
                "sky_color": 7907327,
                "water_color": 4159204,
                "water_fog_color": 329011
            },
            "features": [
                [],
                [
                    "minecraft:lake_lava_underground",
                    "minecraft:lake_lava_surface"
                ],
                [
                    "minecraft:amethyst_geode"
                ],
                [
                    "minecraft:monster_room",
                    "minecraft:monster_room_deep"
                ],
                [],
                [],
                [
                    "minecraft:ore_dirt",
                    "minecraft:ore_gravel",
                    "minecraft:ore_granite_upper",
                    "minecraft:ore_granite_lower",
                    "minecraft:ore_diorite_upper",
                    "minecraft:ore_diorite_lower",
                    "minecraft:ore_andesite_upper",
                    "minecraft:ore_andesite_lower",
                    "minecraft:ore_tuff",
                    "minecraft:ore_coal_upper",
                    "minecraft:ore_coal_lower",
                    "minecraft:ore_iron_upper",
                    "minecraft:ore_iron_middle",
                    "minecraft:ore_iron_small",
                    "minecraft:ore_gold",
                    "minecraft:ore_gold_lower",
                    "minecraft:ore_redstone",
                    "minecraft:ore_redstone_lower",
                    "minecraft:ore_diamond",
                    "minecraft:ore_diamond_large",
                    "minecraft:ore_diamond_buried",
                    "minecraft:ore_lapis",
                    "minecraft:ore_lapis_buried",
                    "minecraft:ore_copper",
                    "minecraft:underwater_magma",
                    "minecraft:disk_sand",
                    "minecraft:disk_clay",
                    "minecraft:disk_gravel"
                ],
                [],
                [
                    "minecraft:spring_water",
                    "minecraft:spring_lava"
                ],
                [
                    "minecraft:glow_lichen",
                    "minecraft:patch_tall_grass_2",
                    "minecraft:trees_plains",
                    "minecraft:flower_plains",
                    "minecraft:patch_grass_plain",
                    "minecraft:brown_mushroom_normal",
                    "minecraft:red_mushroom_normal",
                    "minecraft:patch_sugar_cane",
                    "minecraft:patch_pumpkin"
                ],
                [
                    "minecraft:freeze_top_layer"
                ]
            ],
            "has_precipitation": true,
            "spawn_costs": {},
            "spawners": {
                "ambient": [],
                "axolotls": [],
                "creature": [
                    {
                        "type": "minecraft:sheep",
                        "maxCount": 4,
                        "minCount": 4,
                        "weight": 12
                    },
                    {
                        "type": "minecraft:pig",
                        "maxCount": 4,
                        "minCount": 4,
                        "weight": 10
                    },
                    {
                        "type": "minecraft:chicken",
                        "maxCount": 4,
                        "minCount": 4,
                        "weight": 10
                    },
                    {
                        "type": "minecraft:cow",
                        "maxCount": 4,
                        "minCount": 4,
                        "weight": 8
                    },
                    {
                        "type": "minecraft:horse",
                        "maxCount": 6,
                        "minCount": 2,
                        "weight": 5
                    },
                    {
                        "type": "minecraft:donkey",
                        "maxCount": 3,
                        "minCount": 1,
                        "weight": 1
                    }
                ],
                "misc": [],
                "monster": [
                    {
                        "type": "minecraft:spider",
                        "maxCount": 4,
                        "minCount": 4,
                        "weight": 100
                    },
                    {
                        "type": "minecraft:zombie",
                        "maxCount": 4,
                        "minCount": 4,
                        "weight": 95
                    },
                    {
                        "type": "minecraft:zombie_villager",
                        "maxCount": 1,
                        "minCount": 1,
                        "weight": 5
                    },
                    {
                        "type": "minecraft:skeleton",
                        "maxCount": 4,
                        "minCount": 4,
                        "weight": 100
                    },
                    {
                        "type": "minecraft:creeper",
                        "maxCount": 4,
                        "minCount": 4,
                        "weight": 100
                    },
                    {
                        "type": "minecraft:slime",
                        "maxCount": 4,
                        "minCount": 4,
                        "weight": 100
                    },
                    {
                        "type": "minecraft:enderman",
                        "maxCount": 4,
                        "minCount": 1,
                        "weight": 10
                    },
                    {
                        "type": "minecraft:witch",
                        "maxCount": 1,
                        "minCount": 1,
                        "weight": 5
                    }
                ],
                "underground_water_creature": [
                    {
                        "type": "minecraft:glow_squid",
                        "maxCount": 6,
                        "minCount": 4,
                        "weight": 10
                    }
                ],
                "water_ambient": [],
                "water_creature": []
            },
            "temperature": 0.8
        }
    );
});