Minecraft wiki entry for Safe_home, associated text: Widely considered to be the most dangerous mob(except the bosses) in Minecraft is the creeper, because of the damage it causes to buildings (they can effectively blow large holes in your structures). However, you are safe within your base if there are creepers outside, as they can't get close enough to you to explode. You might even be able to open your door and kill the creeper with a bow and arrows, as long as you keep your distance!