swarm of monsters is a mod that changes the behavior of zombies, creepers and skeletons to make them more dangerous for us. They will now detect you earlier, be more aggressive, and chase you in packs. So much so that they are even able to break down the walls of your house to come and greet you.

You also won’t be able to hide in a barge, basically because those mobs are now able to put blocks in the world, so they’ll be able to reach you by making bridges. An obsidian house is also not a good solution since zombies will be able to break the obsidian. Good luck, you’ll need it…