Minecraft wiki entry for Player_versus_Player, associated text: A good combination of these layers will make the perfect wall that barely any enemies can get in. by adding defense on nether transportation so the enemy can't get in (but you can), your base will be truly impenetrable. Enemies may often found this wall so hard to pass that they give up, or to see the intelligence of you and your allies and have second thoughts about attacking. Also note to use similar techniques about the floor beneath the wall, make them out of slowing blocks, damaging blocks and traps (such as pits or landmines) and use them in tandem with the wall's layers will furthermore enhance the defense.