Minecraft wiki entry for Multiplayer_PvP_bases, associated text: Add defenses. Build smart, so that anyone trying to ender pearl in will either hit a vertical wall and fall to their death, or land on the roof in a layer of lava. Space out some glass to let a bit of light through, which may help to hide your shadow. Another thing you can do to help disguise your shadow is to build the floor out of glass. Using this is a triple victory, as it is cool to look down on the ground, it hides your shadow, and you can see any enemies pillaring up. Build the lowermost deck in a ring shape so that there is no "blind spot" under your base.