I recommend changing the config file so only zombies and mutant zombies spawn.
This modpack changes how minecraft is played, its principal features include:
-Minecolonies. Allows you to create your own colony.
-Terralith. Completely changes minecraft generation.
-Lost Cities. You can see cities through the world.
-Bad Mobs. Edit the config file so only zombies spawn.
-Mutant Mobs. Edit the config file so only mutant zombies spawn.
-Mob sunscreen. Zombies don´t burn through the day.
-Just Enough Guns. Adds guns to the game.
-Variant Tools and Weaponry. Adds more melee weapons.
-Horror elements. You can see scary structures through the world.