Why should you do this? Dangerous events such as Blood Moons can put NPCs living in your base in a pickle. Place a teleporter inside your bedroom that connects to your secret place. Speaking of NPCs, one efficient way to protect the denizens of your base is to build a small ‘hideout’ away from your main dwelling. Once your underground fortress has expanded significantly, you should not spread the NPCs too thin. Keep this in mind if you notice a mob of enemies regularly trying to assault your underground home. A fantastic backup defense is to utilize teleporters and pressure plates against other physical threats.Īlso, placing a group of NPCs in your base can lower the maximum spawn rate of enemies. Having an open space or pit surrounding your underground base will also help protect it from Worms, Wraiths, Reapers, Everscreams, and Mourning Woods. This method will need to consider your base layout, but the three-block-wide pit is the gist of the rule. A pit that is at least three blocks wide will block Corruption, Crimson, and Hallow from spreading. Preventing this from occurring should be at the top of your priority list as soon as possible.Īn effective way to protect your underground base from Corruption is by building empty spaces around it. Corruption, specifically, will be extremely dangerous if your area gets infected. There are two hurdles that you will need to contend with when building an underground base, though: Worms and Corruption.