The Entity Remover (originally known as the Medusa Mod) is a simple but sometimes extremely useful mod. It makes it possible to remove entities (such as mobs) from the game. Instead of having to fight monsters and ultimately kill them you can just set your focus on them to make them disappear.
Let’s say you are out for a night stroll just to get some fresh air. You are following a path and then suddenly a suicidal creeper comes up from nowhere and explodes. The ground beneath you starts to crumble and suddenly you find yourself stuck in a pit of zombies.
In most cases this would result in certain death. But since you’ve got the Entity Remover mod you can simply hold down your finger on the screen and move it over the mobs which you want to remove from existence.