Brutal siege of zombies is a mod that is in charge of modifying the generation of zombies in the world, after certain circumstances, to generate siege situations by zombies. That is, there will be an increase in zombie generation in a timely manner.

With this mod installed, when we hear lightning we can start to worry, because at that moment a multitude of zombie entities could be generated near our position. In fact, the mod can spawn over 300 zombies at once.