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The Twins

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v Retinazer (First Form)
NPC 125-1
Retinazer's first form.
Stats
Type Monster ­
HP 20,000 Heart
Attack 20 (Laser)
50 (Melee)
Defense 10
Summoned By Mechanical Eye (Night only, when Mechanical Eye is used)
Immune To Confused
Lava
v Spazmatism (First Form)
NPC 126-1
Spazmatism's first form.
Stats
Type Monster ­
HP 23,000 Heart
Attack 20 (Cursed Flame Projectile)
50 (Melee)
Defense 10
Summoned By Mechanical Eye (Night only, when Mechanical Eye is used)
Inflicts Cursed Inferno
Immune To Confused
Lava
v Retinazer (Second Form)
NPC 125-2
Retinazer's second form.
Stats
Type Monster ­
HP 8,000/20,000 Heart
Attack 30 (Laser)
20 (Rapid Fire Laser)
50 (Melee)
Defense 25
Summoned By By Retinazer's health dropping to half of its full health
Immune To Confused
Lava
Drops
20-40 Souls of Sight
5-15 Greater Healing Potion
15-30 Hallowed Bar
(only if Spazmatism has been defeated)
100%
Retinazer Trophy 10%
v Spazmatism (Second Form)
NPC 126-2
Spazmatism's second form.
Stats
Type Monster ­
HP 9,000/23,000 Heart
Attack 30 (Eye Fire)
75 (Melee)
Defense 35
Summoned By By Spazmatism's health dropping to half of its full health
Inflicts Cursed Inferno
Immune To Confused
Lava
Drops
20-40 Souls of Sight
5-15 Greater Healing Potion
15-30 Hallowed Bar
(only if Retinazer has been defeated)
100%
Spazmatism Trophy 10%

The Twins are a Hard Mode boss similar to the Eye of Cthulhu, and the only source of Souls of Sight. The boss is made up of two enemies joined by a "rope" of flesh: Spazmatism and Retinazer.

The Twins will sometimes spawn at night during Hard Mode, with the message, "This is going to be a terrible night..." appearing the previous dusk.

Terraria - The Twins New BOSS Terraria HERO05:45

Terraria - The Twins New BOSS Terraria HERO

Overview

The boss fight can be initiated by using a Mechanical Eye, or by waiting for The Twins to spawn normally (although this might take a while). Although the Mechanical Eye requires Souls of Light, that are only available in a world where the Wall of Flesh has been defeated, The Twins can technically be summoned in any world, regardless of whether or not Hard Mode has been unlocked in it. The Twins will only remain as long as it is Night, and will flee the battle at dawn, similarly to the Eye of Cthulhu.

Upon death, The Twins are guaranteed to drop 20-40 Souls of Sight and 5-15 Greater Healing Potions and Hallowed Bars. Defeating them is the only way of obtaining Souls of Sight.

The Twins initially consist of two eyes connected together by a "rope" of flesh, one named Spazmatism and the other Retinazer. They maintain separate health bars, and are not considered defeated until both are killed (note that the first killed Twin will not leave any loot). Each of these two eyes has a unique AI routine, as well as a second form that it will transform into when it is below half health.

Retinazer (First Form)

In its first form, Retinazer will shoot lasers at the player and occasionally close in slowly to make a series of melee attacks. The lasers do not pass through blocks.

Spazmatism (First Form)

Spazmatism, in its first form, will shoot cursed flames projectiles at the player and occasionally make a series of lunges at them. The projectiles do not pass through blocks.

Retinazer (Second Form)

In this form, Retinazer gains significantly more defense and a much more frightening laser attack named Death laser. It will always float above or to the left of the player and use its laser attack. When it is to the side of the player, it will begin to shoot its laser in rapid-fire bursts. It will never attempt to use its melee attack, preferring instead to maintain a constant distance between itself and the player. Note that in this form, Retinazer will not even attempt to shoot at the player if it does not have a clear line of sight, and its lasers do not pass through blocks. The lower Retinazer's health goes down, the faster the lasers become, making it even more dangerous before its death.

Spazmatism (Second Form)

Spazmatism's second form is the most threatening part of The Twins, as it possesses the most defense, the most damaging attacks and the greatest mobility. It will alternate between rapidly charging at the player to use its insanely powerful melee attack, and slowly giving chase while using its medium-range cursed flame breath attack. In this form, Spazmatism will not use the cursed flame attack if it does not have a clear line of sight. Also, Spazmatism's second form looks similar to the Eye of Cthulhu's second form.

Tips

Strategies

The following is a list of strategies that players can employ to defeat The Twins. Remember that making good use of certain tips above can greatly increase the effectiveness and success rate of these strategies.

1) Sky

  • This strategy hinges on the usage of the Gravitation Potion, possibly in conjunction with the Featherfall Potion to constantly fly around in the air, dodging the vast majority of attacks that The Twins unleash. It is recommended to equip an accessory for increased air mobility, such as the Rocket Boots and/or Angel Wings/Demon Wings. It is also absolutely necessary to have an accessory that negates knockback, such as the Obsidian Shield or the Cobalt Shield.
  • When attacking, keep in mind that the bosses will constantly home in on you, so try to anticipate their movements and to not reverse gravity too suddenly, or they might move out of the way of your projectiles. Aiming can be simplified by luring the Twins to the top of the world and then falling straight down as they follow you, but beware of the Wyvern.

2) Skybridge

  • Simply build some Skybridges and run on them, using a Grappling Hook or other mobility-enhancing item to quickly switch between them to move out of the way of a melee charge or barrage.
  • This strategy can work wonders by building a Nurse's house at the start of the skybridge and setting the spawn point there. When low on health the player can teleport back, have the nurse heal them and resume the fight before the Twins have a chance to harm her. Beware that if the player has walked too far from the spawn point, teleporting will make the bosses despawn.
  • This strategy can also work quite well if a player uses a very fast weapon (such as the Megashark or the Clockwork Assault Rifle).

3) Statue Corridor

  • For this strategy, employ plenty of Heart Statues. Using a wide wire grid to connect at least a row of them to pressure plates will cause them to drop plenty of hearts, allowing you to rapidly skip through them and regain lots of health. You can place a row of statues pretty much anywhere to take a small break from the fight in any moment.

Multiplayer Strategy

With the help of one or more friends, fighting the bosses becomes much simpler. With one player luring Retinazer away and taking cover to avoid its attacks, others can concentrate their fire on Spazmatism and kill it quickly, and successively go back to Retinazer and defeat it. Be careful, as if either the player luring Retinazer or all of the ones fighting Spazmatism are defeated, one of the bosses might despawn, making it impossible to get the spoils from beating only one twin.
Terraria-1.1-the-twins

3 players fighting The Twins

ImagesCAL2LUA5

The two forms of the Twins. Spazmatism is on the bottom; Retinazer is on top.

Notes

  • Both of the bosses' names are portmanteaus, and somehow related to the eyes: Retinazer is made of Retina and Laser, and Spazmatism of Spasm and Astigmatism.
  • The Twins, along with Skeletron Prime and The Destroyer, are robotic versions of a previous boss. However, they only appear robotic when they are in their second form.
  • If one of them goes too far from the other one offscreen, it disappears, making it impossible to get loot from only killing one eye.
  • The color of The Twin's pupils' could be a reference to the Mario Brothers (Mario and Luigi), Mario wears red and Luigi wears green, and are also twins.
  • There is a typo when you summon them or defeat them that says, "The Twins has awoken!" and "The Twins has been defeated!" (It should each say "The Twins have awoken/been defeated!") Fixed as of version 1.2.3.1
  • The Twins are normally considered the third hardest Hard Mode boss, after which The Destroyer comes second and Skeletron Prime is first.
  • The Boss Trophy of a single Twin can drop after only that twin has been defeated.
  • There is a chance any monster during Hard Mode will drop the Mechanical Eye if you haven't ever summoned The Twins in the world prior to the 1.2 update. 
  • You can craft the Optic Staff that summons mini twins that will fight for you. 
  • In their first form, the Ichor debuff will reduce their defenses to 0.

Update Info

v1.2.3

  • Spazmatism's health increased to 23,000, decreased damage for both.
  • Spazmatism now transforms at 9000HP and Retinazer now transforms at 8000HP, instead of at half HP.
  • The Twins now drop Twin Mask
  • Now only drops 15-30 Hallowed Bar.

v1.2.1.1

v1.2

v1.1

  • Added to the game.

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