public void registerEvents() {

    PluginManager pm = plugin.getServer().getPluginManager();

    pm.registerEvent(Event.Type.ENTITY_DAMAGED, this, Priority.High, plugin);
    pm.registerEvent(Event.Type.ENTITY_EXPLODE, this, Priority.High, plugin);
    pm.registerEvent(Event.Type.CREATURE_SPAWN, this, Priority.High, plugin);
  }