private boolean isReliquaryCrafted;
    private static final String IDENTIFIER = Reference.MOD_ID;

    public ModWorldSavedData()
    {
        super(IDENTIFIER);
    }

    public ReliquaryWorldData(String name)
    {
        super(name);
    }

    @Override
    public void readFromNBT(NBTTagCompound compound)
    {
        isReliquaryCrafted = compound.getBoolean("isReliquaryCrafted");
    }

    @Override
    public NBTTagCompound writeToNBT(NBTTagCompound compound)
    {
        compound.setBoolean("isreliquarycrafted", isReliquaryCrafted);
        return compound;
    }

    public void onReliquaryCrafted()
    {
        if(!isReliquaryCrafted)
        {
            this.isReliquaryCrafted = true;
            this.markDirty();
        }
    }

    public void setReliquaryCrafted(boolean isReliquaryCrafted)
    {
        this.isReliquaryCrafted = isReliquaryCrafted;
        this.markDirty();
    }

    public boolean isReliquaryCrafted()
    {
        return isReliquaryCrafted;
    }

    public static ReliquaryWorldData get(World world)
    {
        MapStorage storage = world.getMapStorage();
        ReliquaryWorldData instance = (ReliquaryWorldData)storage.getOrLoadData(ReliquaryWorldData.class, IDENTIFIER);

        if(instance == null)
        {
            instance = new ReliquaryWorldData();
            storage.setData(IDENTIFIER, instance);
        }
        return instance;
    }