House Defense
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Defending your house is important, your NPCs rely on your techniques, and so do you. There are a few techniques for different occasions, such as Blood Moons, goblin armies, and just cool stuff to kill enemies with.
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Overview
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Constant threats will terrorize your home including:
- Blood Moon: Zombies and Demon Eyes will relentlessly attack your base until day breaks (regardless of how many NPC you have to keep enemies from spawning near your base) and they can open your door.
- Goblin Invasion: Not as common as a Blood Moon, but worse. 80 goblins, plus an additional 20 per user with 200+ hp, will spawn and attack your base. The biggest annoyance is the Sorcerer, who will teleport all over the area (including inside your home) and can shoot through walls.
- Wraiths: After you defeat the Wall of Flesh, they will spawn at night. They are capable of passing through solid blocks, but can only hover up to three blocks up. Constructing a home suspended at least this distance above the ground will be sufficient to stop them from entering.
- Possessed Armor: After defeating the Wall of Flesh, they will spawn at night. They can open doors on any given night.
- Werewolves: After defeating the Wall of Flesh, they spawn at night during a Full Moon and can break down doors, causing them to drop as items, and letting in all monsters that can fit through the door.
- Clown: After defeating the Wall of Flesh, they will spawn during a blood moon. They throw bombs that can blow up your house giving both the risks of monsters killing you and making your house unsuitable for NPCs
Early-Game Tricks
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One-Way Doors
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Sand Defense
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Placing sand on the opposite side of your door so that it will fall by gravity will damage every monster it lands on and lock down the door. Repeating the process of placing the sand then mining it back is a very safe way of dealing with monsters knocking on your doors.
Suspended Door
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Zombie Pits and Flying Enemy Cages
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Both of these are used to trap certain enemies. In the Zombie Trap's case, it's Zombies and goblins, and in the Flying Enemy Cage's case, it's any flying enemy (except for bats, harpys, and demons), including Demon Eyes, though it can be modified to trap slimes as well. Both traps can be utilized alongside other defensive mechanisms such as sand barriers, suspended doors, and even lava moats.



These types of traps can be set up right at the start of a new world for both safety and the ability to easily kill and loot early enemies. This is particularly useful when starting out in Hardcore Mode. At left is an example of an efficient structure that you can build before the first night.
Thrown Weapon Glitch
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Digging a Deep Pit in Front of Your Door
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Suspended House
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Trick the Zombies
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No Doors
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Simple wall
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Simply barricade your door during a Blood Moon or goblin army. This strategy always works, and requires almost no resources. However, this will not allow you to build monster farms or prevent goblin sorcerers from teleporting in.
Advanced Approach
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The Essentials in Building a More Secure Base
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There are ways to keep your base locked down tighter than a prison. Make only two entrances to your base (via door) on either side of the base. Depending on whether or not you make towers, you can leave these doors open.



You can also add small cubes to the sides of your house in front of doors, and fill them with lava. Dig a six block long trench below them. When attacked, you destroy the bottom block of the cubes. The lava will create a moat that will not destroy items, although if the trench is one block deep into the ground and goes all the way to your door, then Zombies will not be able to open it anyways.






Another technique that can be used is attaching two bunkers, as shown here, to your home. Simply by making two boxes on the sides of your house 4 blocks high with a 2 block gap, you can use any weapon to defend your house as you wish. Then put the doors into your house above the boxes (Or stair-shapes, as I have here). As long as you remain on the bottom floor, monsters will not jump onto the part with the doors, and you can stand inside the box and swing a sword or shoot a ranged weapon through the gap.
If you have managed to get to the Dungeon, you can actually mine the Spikes with a Hammer to put on your base. The spikes themselves will not actually harm monsters but can and will hurt players/NPC's, the only real use for spikes is either aesthetic purposes or PvP.
Sand Shell Method
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A much more effective Blood Moon/Goblin Invasion defense system is shown here where the player breaks a torch and sand falls on the entire home, blocking off all entrances. You can make the sand as tall as necessary depending on how many entrances you have. However, setting up the system is comparatively tedious, as is cleaning it up.
Sniper Nest
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Tower Method of Self-Defense
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Although it utilizes a similar method to the floating base, it is connected to the ground. The tower can be locked down by triggering sand traps to block the bottom entrances of the tower. The tower uses two Flying Enemy Cages to allow capture and harvesting of Demon Eyes (and Eaters of Souls). The advanced versions of the tower can use a secondary sand blocking system, and can also incorporate Zombie Pits and/or Lava Traps to deal with Zombies and Goblins.
Double-Door Pit Trap
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As the name implies, this trap consists of two doors with a two block wide space between them; this space is occupied by a pit that is too deep to jump out of without assistance. Due to this, it would not be wise to attempt this trap without a Grappling Hook, Cloud in a Bottle, or a pair of Rocket Boots. The concept of the trap is that enemies will be able to enter through the first door, but will find themselves falling into a hole when they attempt to break down the second. The player can jump over the pit by opening both doors at once and jumping straight through; this is not an easy task with a low ceiling, so make sure that you own one of the previously mentioned items.
Water U-bend Gate
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Since there is no equivalent to a reverse wooden platform that prevents flying enemies from passing up through the bottom of it while letting players through, this is one of the few reliable methods for preventing enemies from getting up into the bottom of a base that has underground tunnels connected to it or is suspended in the air. For example, placing this structure at the top of a hellevator attached to the bottom of your base can prevent enemies using it as a way in. The obvious alternative is a normal door, but this method doesn't require the extra step of opening and closing the door to get through it.
Double/Single Outer Walls
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These can be built with any number of walls but usually



Lava Pit
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In the Lava Pit the monster fall into lava. Some times these can be hard to build since you need access to lava to make. If you want to collect items that the monster drop make sure that you put only one Lava Bucket in each pit (1 bucket of lava x 6 blocks wide = no item burning). Other wise the items will be destroyed.
Wire Traps
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As of patch 1.1 wires can be used to build traps, such as dart traps, that can be triggered by enemies. These kinds of traps are relatively easy to set up and can be extremely useful in all situations, from blood moons to goblin invasions.
Lockdown Device
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The Lockdown Device is simple, but very effective, device that prevents all monsters, except for monsters that dig/pass through walls, from entering any house. First, lay down a wire line that goes underneath the entire area you wish to defend. Next, put a lever in every house that is being locked down. Third, put a wall of active stone blocks one block away from the outside doors of each house. Attach it to the house right above the door if being used for PVP, to keep lava out. Finally, Wire the levers and the active stone blocks to the wiring you laid out in the first step. Now, you can activate a citywide lockdown from any building.



Dart Trap Fortress
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If you can get your hands on enough Dart Traps, wires, and pressure plates, then you can design a dart trap defense as shown below, simply put, when this many dart traps are wired up, you can effectively fight blood moons, goblin armies, and frost legions from the comfort of your throne. 

