Minecraft wiki entry for Multiplayer_PvP_bases, associated text: Have everyone dig for the base until they find obsidian. If you get mining fatigue, you can spawn a wither, as it is unaffected by mining fatigue. Run away and have the wither blow up the walls. When the wither has blown up the walls, enter the base, and try to take as much loot. Lure the wither into the secret room, and have it blow up the traps. Make sure it doesn't blow up the chest. Take as much loot as you can. Don't kill the wither. Heal it with potions of harming, run away, and have it kill the enemy base owners.