hi, i wrote a little procedure for the item, it works great, but i wish i could put the skeleton skull and the skeleton skull with the skeleton without pressing shift.
here is my code:
 

    @SuppressWarnings("deprecation")
    @Override
    public ActionResultType onBlockActivated(BlockState state, World world, BlockPos pos, PlayerEntity player, Hand hand, BlockRayTraceResult hit) {
        if(player.getHeldItem(hand).getItem() == CoSRPGItems.CosoriteScrap.get()) {
            if (!world.isRemote()) {
                BlockPos YblockPos = new BlockPos(pos.getX(),pos.getY() + 1,pos.getZ());
                BlockState Yblock = world.getBlockState(YblockPos);
                if(Yblock.getBlock() == Blocks.SKELETON_SKULL || Yblock.getBlock() == Blocks.WITHER_SKELETON_SKULL) {
                    if (!player.isCreative())
                        player.getHeldItem(hand).shrink(1);
                    world.playSound(null, player.getPosX(), player.getPosY(), player.getPosZ(),
                            SoundEvents.PARTICLE_SOUL_ESCAPE, SoundCategory.BLOCKS, 1.7f, 0.7f);
                    world.setBlockState(pos.up(1), Blocks.AIR.getDefaultState());
                    if (!player.inventory.addItemStackToInventory(new ItemStack(CoSRPGItems.Cosorite.get())))
                        player.dropItem(new ItemStack(CoSRPGItems.Cosorite.get()), false);
                }
            }
            else return ActionResultType.FAIL;
        }
        return ActionResultType.CONSUME;
    }

how to implement it?

7 hours ago, diesieben07 said:

Check the held item and return ActionResultType.PASS to pass the action on to the item.

it worked, thanks!