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placing a block only places a ghost block which is not visible on the client


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    public void onUse(Level pLevel, ItemStack pWand, LivingEntity pPlayer) {
            List<Entity> list = pLevel.getEntities(pPlayer, AABB.ofSize(pPlayer.position(), this.getSize(), this.getSize(), this.getSize()));
            if (!pLevel.isClientSide) {
                if (pPlayer.getItemInHand(InteractionHand.OFF_HAND).getItem() instanceof SpellItem) {
                    SpellItem spellItem = (SpellItem) pPlayer.getItemInHand(InteractionHand.OFF_HAND).getItem();
                    spellItem.cooldown(pPlayer, this.getCooldown());
                for (Entity entity : list) {
                    if (entity.isAlive()) {
                        if (!pLevel.isClientSide()) {
                            LivingEntity livingentity = (LivingEntity) entity;
                            livingentity.addEffect(new MobEffectInstance(MobEffects.WEAKNESS, 200, 1), entity);
                            livingentity.addEffect(new MobEffectInstance(MobEffects.MOVEMENT_SLOWDOWN, 200, 5), entity);
                            BlockPos pos = new BlockPos(entity.position());
                            pLevel.setBlock(pos, Blocks.ICE.defaultBlockState(), 0);
            else {
                ParticleGen.spheremove(pPlayer.position().x, pPlayer.position().y+(pPlayer.getBbHeight()/2), pPlayer.position().z, 1, pLevel, ParticleTypes.SNOWFLAKE, 0, 0, 0, 1, 50, -3, true);
            super.onUse(pLevel, pWand, pPlayer);


Edited by Just_EmSee
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pLevel.setBlock(pos, Blocks.ICE.defaultBlockState(), 0);

Passing 0 here means no updates are performed.

Using the value 2 will send updates to the client. See ServerLevel.markAndNotify() used by setBlock()

or you could just use setBlockAndUpdate() which passes the value 3 (so it also notifies neighbouring blocks of the change).


There is supposed to be a vanilla class somewhere that holds the values of these bits, but I don't know the name of it. 🙂


If you don't post your logs/debug.log we can't help you. For curseforge you need to enable the forge debug.log in its minecraft settings. You should also post your crash report if you have one.

If there is no error in the log file and you don't have a crash report then post the launcher_log.txt from the minecraft folder. Again for curseforge this will be in your curseforge/minecraft/Install

Large files should be posted to a file sharing site like https://gist.github.com  You should also read the support forum sticky post.

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