swarm of monsters is a mod that seeks to add some difficulty to the game by making hostile mobs much more dangerous. With this mod installed, the enemies will be more aggressive and much more numerous. They will also be able to detect and attack us from much further away, especially 120 blocks away.
As if that were not enough, with this mod installed, enemies will also be able to kill our animals, and they will be able to knock down walls to attack us, or our animals. According to the material of our constructions, it will be necessary more or less to knock down the walls. In addition, if necessary, they will be able to build bridges to overcome obstacles.