mini boss is a mod that adds new mobs to the game or changes to some premade Minecraft mobs, such as zombies and spiders. These new enemies are quite powerful, so they are considered bosses.
Even though the title of the mod contains the word “Mini”, make no mistake about it, these monsters are difficult to fight, so you will need to be well equipped to face them, as they also have special abilities. Once you manage to defeat them, you will be able to get new items and powerful weapons.