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So, after a lot of digging around the forge/minecraft classes i managed to figure it out how the Ore Gen is working. The feature registering remains similar: public static void initGen() { Registry.register( WorldGenRegistries.field_243653_e /* Feature Registering */, ModBlocks.ADAMANTINE_ORE.getId() /* Resource Location */, Feature.field_236289_V_ /* no_surface_ore */.withConfiguration( new OreFeatureConfig( OreFeatureConfig.FillerBlockType.field_241882_a /* base_stone_overworld */, ModBlocks.ADAMANTINE_ORE.get().getDefaultState() */, 64 ) ).withPlacement(Placement.field_242910_o /* depth */ .configure( new DepthAverageConfig(12, 12) )).func_242728_a() /* spreadHorizontally */ .func_242731_b(1) /* repeat */ ); } The most trick part was adding that feature in the already configured features of an biome: public static void setupGen() { for (Map.Entry<RegistryKey<Biome>, Biome> biome : WorldGenRegistries.field_243657_i.func_239659_c_() /* Collection of Biome Entries */) { if (!biome.getValue().getCategory().equals(Biome.Category.NETHER) && !biome.getValue().getCategory().equals(Biome.Category.THEEND)) { addFeatureToBiome( biome.getValue(), GenerationStage.Decoration.UNDERGROUND_ORES, WorldGenRegistries.field_243653_e.getOrDefault(ModBlocks.ADAMANTINE_ORE.getId()) ); } } } public static void addFeatureToBiome(Biome biome, GenerationStage.Decoration decoration, ConfiguredFeature<?, ?> configuredFeature) { List<List<Supplier<ConfiguredFeature<?, ?>>>> biomeFeatures = new ArrayList<>( biome.func_242440_e().func_242498_c() /* List of Configured Features */ ); while (biomeFeatures.size() <= decoration.ordinal()) { biomeFeatures.add(Lists.newArrayList()); } List<Supplier<ConfiguredFeature<?, ?>>> features = new ArrayList<>(biomeFeatures.get(decoration.ordinal())); features.add(() -> configuredFeature); biomeFeatures.set(decoration.ordinal(), features); /* Change field_242484_f that contains the Configured Features of the Biome*/ ObfuscationReflectionHelper.setPrivateValue(BiomeGenerationSettings.class, biome.func_242440_e(), biomeFeatures, "field_242484_f"); }} Actually it seems that there's no proper way of doing this by now, since i needed to use the "setPrivateValue". It's not ideal ... but it works. Thanks a lot for the guidance.

i'll look into it, thanks. Any news i'll post here.

1.16.2 has biomes/dimension now data-driven. The system is currently being implemented to allow for appending features/structures/spawns to them.