@Override
  public SpellResult start(CastContext context) {
    Mage mage = context.getMage();
    MageController controller = context.getController();
    Player player = mage.getPlayer();
    if (player == null) {
      return SpellResult.PLAYER_REQUIRED;
    }

    List<Player> allPlayers = null;
    players.clear();

    if (allowCrossWorld) {
      allPlayers = new ArrayList<>(controller.getPlugin().getServer().getOnlinePlayers());
    } else {
      allPlayers = context.getLocation().getWorld().getPlayers();
    }

    Collections.sort(
        allPlayers,
        new Comparator<Player>() {
          @Override
          public int compare(Player p1, Player p2) {
            return p1.getDisplayName().compareTo(p2.getDisplayName());
          }
        });

    int index = 0;
    for (Player targetPlayer : allPlayers) {
      if (!context.getTargetsCaster() && targetPlayer == player) continue;
      if (targetPlayer.hasPotionEffect(PotionEffectType.INVISIBILITY)) continue;
      if (!context.canTarget(targetPlayer)) continue;
      players.put(index++, new WeakReference<>(targetPlayer));
    }
    if (players.size() == 0) return SpellResult.NO_TARGET;

    String inventoryTitle = context.getMessage("title", "Select Player");
    int invSize = ((players.size() + 9) / 9) * 9;
    Inventory displayInventory = CompatibilityUtils.createInventory(null, invSize, inventoryTitle);
    for (Map.Entry<Integer, WeakReference<Player>> entry : players.entrySet()) {
      Player targetPlayer = entry.getValue().get();
      if (targetPlayer == null) continue;

      String name = targetPlayer.getName();
      String displayName = targetPlayer.getDisplayName();
      ItemStack playerItem = InventoryUtils.getPlayerSkull(targetPlayer, displayName);
      if (!name.equals(displayName)) {
        ItemMeta meta = playerItem.getItemMeta();
        List<String> lore = new ArrayList<>();
        lore.add(name);
        meta.setLore(lore);
        playerItem.setItemMeta(meta);
      }
      displayInventory.setItem(entry.getKey(), playerItem);
    }
    active = true;
    mage.activateGUI(this, displayInventory);

    return SpellResult.NO_ACTION;
  }