Simple Biome Modifier generator

The following is a form that can generate some simple biome modifier types. Please make sure that the biome/biome tag/features/entity-types you insert actually exists.

Disclaimer: This tool does not perform validity checks on the generated JSON. Please review and test the output carefully to ensure it works as intended. Use with caution.

NOTE

For a list of valid vanilla tags you can check the wiki

---

Forge loader: neoforgeforge
Modifier Type: add_featuresremove_featuresadd_spawnsremove_spawns
Biomes:

Features:
Decoration Step: lakeslocal_modificationsunderground_structuressurface_structuresstrongholdsunderground_oresunderground_decorationfluid_springsvegetal_decorationtop_layer_modification

---

Please insert at least 1 biome / biome tag

Add Features

The add_features biome modifier type allows you to add placed features to biomes.

The parameters required are the following:

• biomes - Accepts a biome id, [list of biome ids], or #namespace:biome_tag
• features - Accepts a placed feature id, [list of placed feature ids], or #namespace:feature_tag
• step - Specifies the generation step the feature will get added into (See generation steps section of the wiki )

An example of a biome modifier that mimics how bamboo gets added to jungles in code:

{
    "type": "neoforge:add_features",
    "biomes": "#minecraft:is_jungle",
    "features": "minecraft:bamboo_vegetation",
    "decoration": "vegetal_decoration"
}

Remove Features

The remove_features biome modifier type allows you to remove placed features from biomes.

The parameters required are the following:

• biomes - Accepts a biome id, [list of biome ids], or #namespace:biome_tag
• features - Accepts a placed feature id, [list of placed feature ids], or #namespace:feature_tag
• step - Specifies the generation step the feature will be removed from (See generation steps section of the wiki )

An example of a biome modifier that will remove bamboo from jungles

{
    "type": "neoforge:remove_features",
    "biomes": "#minecraft:is_jungle",
    "features": "minecraft:bamboo_vegetation",
    "decoration": "vegetal_decoration"
}

Add spawns

The add_spawns biome modifier type allows you to add mob spawns to a biome.

The parameters required are the following:

• biomes - Accepts a biome id, [list of biome ids], or #namespace:biome_tag
• type - Type of mob to spawn
• weight - The spawn weight (must be above 0)
• minCount - The minimum group size (must be above 0)
• maxCount - The maximum group size (must be above 0)

An example of a biome modifier that that mimics how cows are added to jungles in code:

{
    "type": "neoforge:add_spawns",
    "biomes": "#minecraft:is_jungle",
    "spawners": {
        "type": "minecraft:cow",
        "maxCount": 4,
        "minCount": 4,
        "weight": 8
    }
}

Remove spawns

The remove_spawns biome modifier type allows you to remove mob spawns from a biome.

The parameters required are the following:

• biomes - Accepts a biome id, [list of biome ids], or #namespace:biome_tag
• entity_types - Accepts a entity id, [list of entity ids], or a #namespace:entity_tag

An example of a biome modifier that that will remove cows from jungles

{
    "type": "neoforge:remove_spawns",
    "biomes": "#minecraft:is_jungle",
    "entity_types": "minecraft:cow"
}