for (int i = 0; i < vault.size(); i++) {
	final int I = i;
	Bukkit.getScheduler().scheduleSyncRepeatingTask(plugin, new Runnable() {
		public void run() {
			vault.get(I).getBlock().setType(Material.STONE);
                        if (I + 1 == vault.size()) {
                            player.sendMessage("§5Nexus §6created!");
                        }
		}
	}, i * 1, 0);
}