Luis_ST

post debug log

the ConfiguredFeature works i copied your code and i found the feature, but it's very rare, rare than the pumpkin feature private void setup(final FMLCommonSetupEvent event) { MINT = register("mint", Feature.RANDOM_PATCH.configured((new BlockClusterFeatureConfig.Builder(new SimpleBlockStateProvider(Blocks.BARREL.defaultBlockState()), SimpleBlockPlacer.INSTANCE)) .tries(64).noProjection().whitelist(Sets.newHashSet(Blocks.GRASS_BLOCK)).build()).decorated(Features.Placements.HEIGHTMAP_DOUBLE_SQUARE).chance(24)); } private static <FC extends IFeatureConfig> ConfiguredFeature<FC, ?> register(String name, ConfiguredFeature<FC, ?> configuredFeature) { return Registry.register(WorldGenRegistries.CONFIGURED_FEATURE, new ResourceLocation("examplemod", name), configuredFeature); } public static ConfiguredFeature<?, ?> MINT; @SubscribeEvent(priority = EventPriority.HIGH) public static void name(BiomeLoadingEvent event) { if (MINT != null) { event.getGeneration().addFeature(Decoration.VEGETAL_DECORATION, MINT); } } and (I had to scale down the picture because it was too big)

okay first of all you need to create a Capability which contains a value (a boolean), then you need an interface with two methods a get and a set method for the value, register the Capability as described in the forge doc and Attach the Capability to the player via AttachCapabilitiesEvent<Entity>. use the PlayerEvent.PlayerLoggedInEvent and check inside the if your Capability is present (you get it via PlayerEntity#getCapability), then get the value from the Capability and check if its false, if its the case give the player the sword and set the value to true

use the vanilla registry of ConfiguredFeature inside the FMLCommonSetupEvent

first of all you can't create the ConfiguredFeature inside the event because you need to register them second, take a look at the vanilla Features class how to create ConfiguredFeature, then copy the vanilla registry and do this for your ConfiguredFeature inside FMLCommonSetupEvent

try without optifine

in .minecraft/logs/debug.log

post debug log

answer: do not use event.enqueueWork

did you know how the Biome Layer works, did you looked at the vanilla code, sounds like you don't knw much about the biome layer they still use the ids which is why i hate this system, but forge dosen't has a BiomeProvider/BiomeSource which make this easly forge has biome IDs?

1.17 requires java 16

you also need to set the field you only get the field from the class

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

you get the same error beacuse you never call setAccessible for the Field

then you need to store a value for each player you have given the sword, using a Capability

post the error log...

PlayerEntity#position returns the current player pos as an Vec3 PlayerEntity#teleportToWithTicket teleports the player to the given position

is is an example how to check, if the player has or has not an item in his inventory

no the normal registration is via json or DeferredRegister but you should register an id for your biome use Refection or an Access Transformers do this in FMLCommonSetupEvent

thats the wrong class and the wrong object type its: net.minecraft.world.biome.BiomeRegistry.idToKeyMap or net.minecraft.world.biome.BiomeRegistry.TO_NAME which is a Int2ObjectMap

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

did you using mcp or moj mappings?

this is an practical example

no not register with DeferredRegister you need to add your Biome to BiomeRegistry.TO_NAME