Guide:Defending against invasion events

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This guide deals with the events currently implemented in Terraria as of 1.3.

Blood Moon

Blood Moon Defense.png

Blood Moons are rather frequent events that can be a hassle for newer players who are caught unaware. Not only does the monster spawn rate increase dramatically during a Blood Moon, but the max amount of enemies that can be on screen also rises significantly, allowing swarms of enemies to appear at one time. Additionally, monster spawns completely ignore reduced spawn rates by way of NPCs. Zombies can break open doors during this event, posing significant danger to NPCs inside houses. However, there are ways to profit from Blood Moons if one is prepared, especially thanks to rare spawns like The Groom.

Generally, Blood Moons can be seen safely through by simply staying in your base, as long as all doors are either prevented from opening inwards or simply barricaded by blocks. Blood Moons do not spawn truly dangerous enemies; they simply increase the spawn rate and maximum onscreen limit while introducing a few rare variations such as Corrupt Bunnies and Corrupt Goldfish. This means that players who are adept at handling zombies and Demon Eyes have little to fear from this event. In hardmode, the Blood Moon becomes harder as Clowns will spawn.

Goblin Army

Goblins will appear at the spawn point and kill any NPCs they find. They will continually spawn until their army limit is reached before the event will end. This group has multiple types of units with different attack patterns, so strategies for dealing with them will differ depending on the type of goblin.

  • The Goblin Sorcerer will teleport no matter where the player(s) are and will shoot a projectile at you.
  • The Goblin Thief is a fast paced enemy that can jump high and open doors faster than other goblins.
  • The Goblin Peon is 2 blocks tall and can destroy doors.
  • The Goblin Warrior has more health and does more contact damage to players.
  • The Goblin Archer will shoot wooden arrows at the player(s).
  • The Goblin Summoner is a Hardmode-exclusive goblin that is much stronger than the others, but drops much greater loot.

If the player is strong enough to easily handle the goblins, a long, flat field near the base would be the best place to deal with the army, as it would be close enough to the spawn point to appear while keeping the goblins away from the NPCs. Weapons that can do damage to multiple enemies at once such as the Space Gun or Jester's Arrows are useful for taking out crowds.

Digging a pit on both sides of your base is a simple but effective way of holding back most of the goblins, save for sorcerer and archer goblins. Just simply dig a hole five deep by six wide or dig the pit next to a wall so when the goblins try to jump the pit they will hit the wall and fall into the pit. The downside to using a pit by itself, (without lava or other traps), is that after taking out the sorcerers and archers you still need to take care of the goblins in the pit. However, you can use the Spiky Balls dropped from the goblins you killed earlier and throw them into the pit to take them out from a safe distance.

Pirate Invasion

The Pirate Invasion is very similar to the Goblin Army, except the pirate invasion can only be triggered in hardmode, and is much harder than the Goblin Army. The Pirate Invasion has multiple types of units with different attack patterns.The event currently contains six (seven in PC) enemies, the Pirate Crossbower, the Parrot, the Pirate Deckhand, the Pirate Deadeye, the Pirate Corsair, the Pirate Captain, and the PC-exclusive Flying Dutchman. The player can summon the event using the pirate map which has a 1% chance to drop from mobs in the Ocean biome. The event can also happen on its own, with a 1/30 chance if it is has not happened yet in the world. The Pirate Invasion can easily give 1-2 platinum if the player does not die.

If you want to face the pirates head-on you must be prepared. Defeating these pirates is not an easy feat for a fresh hardmode player. You will want to use weapons that pierces multiple enemies at once, such as Jester's arrows or the Magical Harp. Alternatively, you can make sure the pirates stay below you, with you on a wooden platform or you can just stand on top of your house or a high wall, use the Nimbus Rod and wait until the Event gets over. Then use some kind of high-level Spear to slay the attackers. When a captain attacks, focus all of your attention on him, because he will stop attacking when attacked. If you have the Uzi or Minishark/Megashark it is a good tactic to continually fly over the pirates and shoot at them. On the PC version, the Flying Dutchman will rain down cannonballs on you while spawning more of the basic pirate enemies. To take it out, fly up to it and use a piercing weapon to hit multiple cannons at once. When you take out all 4 cannons, the ship will explode.

Solar Eclipse

The monsters spawned during a Solar Eclipse are very powerful. The Reaper acts similarly to a Wraith, but with higher stats. The Swamp Things are extremely fast, and they are as common as zombies. Vampires are equally as common as zombies, and can turn into bats if the player is above them. Eyezors are not very common during a Solar Eclipse, but they can shoot lasers from their eyes, making them formidable enemies. They are slightly faster than regular zombies. Frankensteins are common as zombies, but move much faster.


The Solar Eclipse strategy is simple to understand. Every enemy but the Reapers and Vampires use standard Fighter AI, (and even the same jump range as basic Zombies and Goblins,) and will walk into pits just like any other zombie. Lava pit traps will destroy the whole invasion force but the reapers. Hence, the easiest way to nullify most of the threat is to dig a simple tunnel underneath a small lava pit on some leveled terrain. That allows players to simply focus on fighting the Reapers alone, (which are rare enough that you rarely fight more than one at a time,) while collecting all the drops.

Frost Legion

There are three unique monsters in the Frost Legion, named Mister Stabby, Snowman Gangsta, and Snow Balla. The Frost Legion does not happen on its own. The player has to obtain a Snow Globe from a Present to summon them. The summon item can only be obtained in Hardmode, but the Legion can still be summoned and defeated in a non-Hardmode world. Mister Stabby is a threat due to his high contact damage, and it is suggested to fight the entire event with ranged weapons. However, the enemies deal medium to high damage, so sets with a higher defense value are suggested.

For the Frost Legion, if you're far enough underground, then the snowmen won't spawn, even after getting the message that they've arrived, so you don't have to head back to your house immediately upon receiving message of an imminent attack. However, they will remain and will appear if you surface. The Snowmen are incapable of jumping down from simple wooden platforms, meaning it is possible to construct a basic trench with a wooden platform above it, and be completely out of harms way.

If you place lava pits on either side of your house, you can defeat most of the snowmen that spawn, however, Snow Ballas may block up the traps, inhibiting the trap from killing any more snowmen. Filling the empty space of any traps with Wooden Beams will prevent Snow Ballas from blocking up the traps. The beams occupy the same layer as other furniture and do not block movement.

Pumpkin Moon

The enemies during a Pumpkin Moon are very dangerous, especially The Headless Horseman and Pumpking. The player has to craft a Pumpkin Moon Medallion to start a Pumpkin Moon. The event should not be attempted with lower tier armour and weapons as the enemies have high health and damage. Rangers should have Shroomite armor, casters Spectre armor and melee Turtle armor or Beetle armor. (Note that in the Mobile version Mobile version that Spectre Armor does not have 40 or 32 defense, but 24 defense.) Vampire Knives are also highly recommended to stay alive in higher rounds since most enemies can dish out high damage. Some Pumpkin Moon enemies are susceptible to the Ichor debuff, making a Flask of Ichor useful in earlier waves. Towards the later waves, the player will mostly be attacking Pumpkings, which are immune to Ichor, making the debuff less useful. It is a good idea to place Spear Traps over areas where enemies will be congregating. Spear Traps work best when wired to different timers, as a row of spears firing at the same time can only hit an enemy once. A somewhat easier way of dealing damage to these congregated enemies is to use the Nimbus Rod.

Frost Moon

The enemies during a Frost Moon are very dangerous, being essentially stronger versions of the Pumpkin Moon enemies. The player has to craft a Naughty Present to start a Frost Moon. A large arena is extremely useful to necessary in the fight. It is suggested to fight the invasion on multiplayer, because the enemies are tough and numerous.

Due to the fact that this event is EXTREMELY hard, it is highly recommended (if not outright mandatory) to wear top-notch end-game equipment. It is furthermore highly advised to build an arena with traps (Lihzahrd-type ones) and lava to help deal with the waves of monsters, much in the same manner as with the Pumpkin Moon. The arena should also feature a nearby house serving as a spawn-point for dead players. Wounded monsters will regain full life if the house is too far away. The event lasts throughout the night (7:30pm) only and will end on dawn (4:30am), making high damage a must to properly advance and obtain loot.

Spectre Robe.png Mage set:

The mage set is perhaps the most powerful set due to the armor's ability to heal the caster and his/her allies. Despite making the wearer somewhat fragile, the healing output has the potential to usually pull through. The reduced damage output, however, makes it difficult to progress through the waves, so it is recommended to switch to the Spectre Mask when not in danger of dying. With the game featuring some powerful magical weapons, the mage set can provide the greatest healing currently possible (surpassing the Vampire Knives). This makes it very nifty for multi-player and extremely recommended for single-player. The best magic weapons obtainable before the Lunar events are the Blizzard Staff, Bubble Gun, Laser Machinegun, and Razorpine, though the Razorpine and Blizzard Staff can only be obtained from the Frost Moon itself. It should be noted that although the Nimbus Rod provides great damage, its mechanic makes it more of an assisting weapon. The Razorblade Typhoon not only pierces infinitely, but also is a homing weapon, making it an excellent choice for crowd control or fighting the Ice Queen. Also note that if you cannot afford the vast amounts of Greater Mana Potion/Super Mana Potion that is required for sustaining your mana, you may also arguably swap the Avenger Emblem for Magic Cuffs/Celestial Cuffs. If you are doing this event solo, it is recommended to use the Spectre Mask instead of the Spectre Hood, or your DPS will not be high enough to reach the later waves. Use the Razorblade Typhoon to kill the weaker enemies quickly, and use the Bubble Gun to decimate the grounded bosses. The Razorpine is useful against the Ice Queen, as is the Laser Machinegun.

Note: As of the 1.2.3 patch, the Mage approach has received two heavy nerfs. The first is the Spectre Hood now reducing magic damage by 40%, the second that consuming a mana potion causes Mana Sickness. This has undoubtedly reduced the capability of this tactic quite a bit. The latter nerf has likely made any "Cuffs" accessory of much greater convenience.

Shroomite Breastplate.png Ranged set:

The ranged set is likely capable of lashing out the most damage. With the proper gear and a suitable positioning (to trigger/keep the armor's ability), chances are good the player can utterly destroy any incoming enemies near instantly. The ranged set does however not supply any sort of healing, and is thus more dependent on multiplayer support or an arena designed to prevent enemies from being able to deal contact damage, along with blocking enemy attacks. Crystal Bullets are recommended, as each shard can damage nearby enemies, and boss enemies can run into them, taking more damage. The Tsunami can easily take out most enemies quickly, and Holy Arrows can be used to take out groups of enemies quickly, as each shot spawns 10 stars, and Ichor arrows can easily take out boss enemies very quickly, but the lack of velocity can make hitting Ice Queens difficult.

Beetle Scale Mail.png Melee damage set:

For soloing purposes, there appears to be two approaches with a melee damage set:

  • Vampire Knives: This method aims to sustain the player's life through the Vampire Knives. Though it is weaker than the mage set, it is powerful enough (thanks to the high armor) to survive several waves of the Pumpkin Moon and Frost Moon events, and can thus be used as a stepping stone to obtain weapons for other sets (such as Razorpine or the Blizzard Staff).
  • The Horseman's Blade: This method relies of the The Horseman's Blade's ability to spawn homing pumpkins. It is dependent on a cluster of statues to spawn weak monsters, much like an ordinary statue farm.
  • Another method is to use The Horseman's Blade initially against the weaker monsters, as the pumpkin heads will often kill other monsters that would otherwise have been missed. The Flairon can then be used to great effect against the Everscreams and Santanks, and also the Ice queen if you can keep up with her(Fishron Wings will help with this). If the velocity of the Flairon bubbles proves too slow to catch up with the Ice Queen, the Possessed Hatchet can deal reliable damage in the meantime, while waiting for the Ice Queen to start a stationary spinning attack. Vampire Knives can be used in reserve in case the player needs to heal up. The North Pole can be used to fight the Ice Queens, as if the projectile is fired straight upwards, the queen will fly through the snowflakes left by it, and these will also fall to the ground and damage any monsters on the ground too. A melee approach has the advantage of the high defense offered by Beetle Armor, which greatly increases survivability.

Beetle Shell.png Tanking set:

The tanking set is, like the ranged set, aimed at multi-player. Its purpose is to direct monsters' attention so that more fragile characters can butcher them all. For this reason the set has a high value of defense, and consequently lesser damage than the other sets. If, during multi-player, the overall healing is good enough, some defense-granting accessories may arguably be replaced by damaging-increasing ones, such as those used by the melee-damage set. The weapon can similarly be something else than the Vampire Knives. Though the player probably won't die that often, this set is unlikely to perform well in single-player due to how the low damage won't allow for much wave advancement.

Mobile/console-only alternate melee

  • Armor: Dragon armor or turtle armor [Dragon armor recomended]
  • Weapons: Terra Blade, Paladin's Hammer or Possesed Hachet
  • Accesories: Fire Gauntlet/Mechanical Glove/Moon Stone/Celestial Stone/Spooky Wings

This is a very effective mobile set with minimal preparation required, except for the acquirement of the Paladin's Hammer, the Terra Blade, the Possessed Hatchet, and repeatedly farming for Shadow Hammers if your world generated with Palladium, Orichalcum, or Titanium. The fight will be less difficult in Mobile as the Paladin's Hammer has been granted autoswing, as with all weapons.

Notes:

 ¹ As the honey buff is obtained by touching honey, its uptime may be tricky to maintain. It may be easier to suspend the liquid in the air using Bubble blocks, purchased from the Party Girl.  ² These items help you see monsters, but can likely be omitted without much consequence.
also this set is good for the pumpkin moon

  • In addition to buff potions, players should also bring Greater Healing Potions and Super Mana Potions. As the latter is likely to be consumed in extreme quantity, the player should bring vast amounts.
  • Please note that all the mentioned accessories above are recommended to have good modifiers, if not the best.
    • The mage, ranged, and melee damage sets should have Menacing (4%+ damage) or Lucky (4%+ critical strike chance) and the tanking set should have Warding (4+ Defense).
  • The Star Veil's (and the Cross Necklace's) ability to increase the player's invincibility after taking damage is crucial to this fight. Without it, the player is unlikely to survive for long.
  • A Wings accessory is not mandatory, but can be of help. They will not see much use until Ice Queen shows up, at which point they can be used for chasing her and dodging her attacks.
  • The Vampire Knives will not work properly on targets under constant damage, such as when standing in lava or below a Nimbus Rod-cloud. A way to solve this is by making an arena in which the player is partly surrounded by a large rectangle of blocks. The Everscreams and Santa-NK1s will be able to pass through the wall and rise to the "floor" of it, (thus getting above the lava) at which point the Knives can hurt them, while the other monsters are kept outside/below the rectangle and have to remain in the lava.
  • It is useful to summon at least one minion for the fight. Either the Tempest Staff, Deadly Sphere Staff, Raven Staff, or Xeno Staff will work. Using the Bewitching Table and Summoning Potion, it is possible to have three minions at once with no investment. Minion damage is maximized if the minions are summoned while wearing summoning armor, ideally Spooky Armor. The armor can be removed without penalizing the damage of those minions already summoned.

Martian Madness

The smaller enemies can be easily defeated using a generic trap, one of which would be a platform above a lava pit, which may or may not have Dart Traps, or traps from the Lihzahrd, built in. It is also advisable to have some heart and/or star statues hooked up to a timer.

The only hard part about the event is the Martian Saucer. However, almost all damage from it can be avoided by simply building a roof over the player's head. Almost all of the Saucer's attacks can not go through blocks (with the exception of the rockets' AoE damage), and it will always hover a given height over the player, so a roof can easily be constructed between. All the player needs is a weapon that can go through blocks. The Blizzard Staff, or the Nettle Burst or Vilethorn will suffice, though the Blizzard Staff is the best choice.

An example of a lava pit, complete with heart/star statues and traps hooked up to a timer.

If you are a summoner, you can very easily farm this event by sealing yourself in a box that is small, but not small enough so that the Martian Saucer's missiles can harm you through the walls with splash damage. If your summons cannot pass through solid blocks, then be sure to summon them outside of the box so they can reach the enemies.

General tips

Lava

Lava is a useful tool for thinning out the numbers of enemies. By placing a single bucket of lava in a sufficiently wide 1-block-deep trench, it is possible to create a pool shallow enough to kill off most enemies while preserving their loot (such traps can be tested easily by throwing cheap items into the trench—if they burn up, widen the trench). This is a common way to burn enemies to death while allowing their item drops to collect as they approach your home. Other variations include "waterfalls" of lava or even entire moats, albeit using large bodies of lava means any item drops will be destroyed as well, though it is always fun to watch zombies pour into a pit of lava in masses.

Spiky Ball Trap Moat

Similar to the lava pool is the Spiky Ball Trap Moat. If you have recovered spiky ball traps from the Lihzahrd Dungeon, you may dig a moat completely under your house. The moat should be at least 12 blocks deep. Next, mount spiky ball traps to the underside of your house at regular intervals. Connect the spiky ball traps to a 3 second timer inside your house. Activate the timer once the invasion begins to rain down spiky balls on the invading enemies.

Dart Trap

Although they do not deal a lot of damage, Dart Traps or Lihzahrd Super Dart Traps are an easy-to-use method of defending your base. All you have to do is set them up on the outside of your entrances and set up manual triggers using switches or levers, or automatic triggers such as pressure plates or timers. It is a good way to keep the weaker enemies out of your base, although it is more of an offensive technique than a defensive one. If you're using one of the aforementioned automatic techniques, you should be careful not to let you or your NPC villagers get shot when going out of their houses. Try not to block the door with dart traps, though.

Active Stone Blocks and Actuators

If you have the mechanic it's easy. Place the active stone block one side of the door and wire it to a switch. It will block zombies,most goblins, and if you're quick, even Swamp Things. You could even make the "door" out of active blocks and turn them off when you need to go through. The same effect can be achieved with actuators.

By using actuators and Grey, Brown, Blue or Lihzahrd pressure plates, you can create a player only door that doesn't even require you to use your cursor. Set up the door as you would an active stone/actuator door and because Grey, Brown, Blue or Lihzahrd pressure plates can only be activated by the player nothing else is able to enter (Or escape). This also works with active stone blocks, which will not look at all weird if your house is made of stone!

Tower of Death

If you are in hardmode and have acquired the Nimbus Rod and Wings or anything that allows flight, there's a very efficient and safe way to farm or survive most of these events by making a tall tower, 20 blocks or higher,at least 4 blocks wide, with two entrances from the ground for enemies to come in. At the top of the tower(inside), fly to the top (don't end up killing yourself by using rod of discord), and place some Platforms right under you, enough to cover the width of the tower. Place some torches, if needed. Whenever an event occurs, go to this tower, stand there, constantly summon the clouds, and watch as enemies walk in to their miseries. Note: this method is not perfect, but would cover most of the harms during an event, especially in hardmode. This is very useful during Solar Eclipses, considering you need to worry about the Reapers. The Crimson Rod is not recommended for hardmode Events because of it's low damage output. This also works well with the Water Candle and Battle Potions, if you don't mind the risks of higher spawn rates. You can also make some add-ons to the entrances, making them extend outwards to keep out flying enemies, except the Reapers and wraiths, but due to their movement, they still pose little threat to your tower.

Lava Moat

Doing this will guarantee to group all the naturally spawned enemies into one tight space so you can focus your damage easily and won't have to wait for the enemy to come to you. Plan this on a flat sheet of land on the surface with no nearby holes or caves. Simply make a 1 block deep and ~40 block wide hole on both sides of your arena then cover them with a thin layer of lava, make sure to have a 10-15 strip of land (lava-cleared) between the two lava moat. Because enemies can't spawn on lava all enemies will be forced to spawn on the thin landstrip between the lava moats . Though make sure while the event is happening, stand on a platform above the landstrip but high enough so you can't see it since you can't actually see the enemies spawning on the landstrip but you can see them coming out of that place. Remember to test your lava moat arena with naturally spawning surface slimes first before testing it on an actual event. Add traps for extra dps along with heart lantern, campfire, heart statue and star statue if you're a mage for general purposes.

Invincibility Machine

Invincibilitymachine.jpg

This technique involves overriding all forms of damage with the temporary invincibility granted when damage is taken from a weak enemy such as a statue-spawned slime. This is useful when dealing with Moon events, such as the Pumpkin Moon and Frost Moon, though it also works against bosses (with the exception of the Moon Lord, for whom special measures were put in place to prevent this). The machine fails if the protective slime is killed.

The machine consists of a small 5x6 box half-filled with Honey, such that the player will receive the Honey Regeneration buff, but without drowning. A Teleporter provides an easy way into the machine, and various switches are available to toggle traps and the actuated spawn surface. The Teleporter is optional; you could just actuate yourself in from the top.

It's important to note that the machine will only work if the Slime Statue is initially activated when there are no other enemies present. The best way to achieve this is to block all available spawn surfaces with a thin layer of lava and deactivating the actuated spawn surface (monsters can spawn at distances between 62 and 84 tiles away from the player). This way, the slimes spawned from the statue will have damage priority over any other mobs that spawn thereafter. Lastly, reactivate the spawn surface before starting the event. If any NPC is killed while the machine is in use, then it will fail.

The downside of an invincibility machine is that the player's options become limited. Generally, the best approach is to use a summoner build with the highest-damage summoning armor available and five damage-increasing accessories (Summoner Emblem, Papyrus Scarab, Necromantic Scroll, Hercules Beetle, and Avenger Emblem - all with the Menacing Modifier). Most summoning weapons can attack enemies outside while preserving the protective slime. The exceptions are the Tempest Staff, Stardust Dragon Staff, and Rainbow Crystal Staff. The Stardust Guardian will kill the slime if placed too close to the player, but it is okay to summon it at a distance.

One of the few weapons that can be used from within the box is the Blizzard Staff, as its projectiles cannot enter the invincibility machine. The Meteor Staff can be used the same way, but the box must be constructed with a thicker ceiling, because the explosions can potentially kill the slime. The Chlorophyte Partisan can also damage enemies outside without hitting the slime (when aimed upwards), and although it won't be the biggest source of DPS, it's better than nothing. In the late game, one can also set up a Staff of the Frost Hydra and Lunar Portal Staff for free damage. The Lunar Flare may be used to eliminate faraway enemies to either side, but any explosion that occurs too close to the machine will kill the slime. It also might not be a bad idea to grapple to the side of the machine, because being knocked around by a slime is a little bit annoying (though it won't compromise the integrity of the machine).