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The TwinsHardmode exclusive
The Twins
Classic mode icon Classic
Expert mode icon Expert
Master mode icon Master
Statistics
Type
Environment
Max Life430006450082237 (total)
Defense10
KB Resist100%
Immune toPoisonedConfused
Drops
Coins1230

Retinazer Trophy "This is going to be a terrible night..." Spazmatism Trophy

The Twins are a Hardmode mechanical boss and are essentially a more difficult version of the Eye of Cthulhu. The Twins are two separate flying entities, Retinazer and Spazmatism, connected by a tendril, each with its own attack pattern and life count. Both must be killed in order to defeat the boss.

The Twins can be summoned manually using a Mechanical Eye at night (7:30 PM to 4:30 AM). They also have a 10*1/10 (10%) chance to spawn naturally at dusk once a Demon or Crimson Altar has been destroyed, as long as they have not yet been defeated at least once in the current world. If spawning this way, their arrival is announced by the status message "This is going to be a terrible night...".

The Twins must be killed before dawn, otherwise they flee and despawn.

While The Twins are alive, the music Boss 2 will play. When Otherworldly music is enabled, the track Boss 2 (Otherworldly) will play instead.

Quick Answers

What are the names of the two entities that make up The Twins in Terraria? toggle section
The Twins in Terraria are made up of two individual entities known as Retinazer and Spazmatism.
Provided by: Fandom
How can The Twins be summoned in Terraria? toggle section
In Terraria, The Twins can be summoned using a Mechanical Eye. However, they can also spawn naturally once a Demon or Crimson Altar has been destroyed, as long as they haven't been defeated at least once in the current world. If they spawn this way, their arrival is announced by the status message 'This is going to be a terrible night...'. Remember, The Twins must be defeated before dawn, otherwise they will flee and despawn.
Provided by: Fandom
What does 'This is going to be a terrible night' signify for The Twins in Terraria? toggle section
In Terraria, the phrase 'This is going to be a terrible night' signals the arrival of The Twins, a Hardmode mechanical boss. This status message appears when The Twins are about to spawn, adding a sense of dread and anticipation to the game. The Twins are a more difficult version of the Eye of Cthulhu and must be defeated before dawn, otherwise, they will flee and despawn. So, when you see 'This is going to be a terrible night', prepare for a challenging battle!
Provided by: Fandom
What are the attack patterns of Retinazer and Spazmatism in Terraria? toggle section
In Terraria, The Twins, Retinazer and Spazmatism, have unique attack patterns. Retinazer, the eyeball with the red iris, fires high-velocity Eye Lasers and usually tries to stay diagonally above the player. Spazmatism, the eyeball with the green iris, fires medium velocity balls of Cursed Flame and typically tries to stay horizontally in line with the player. Both alternate between their signature ranged attacks and charging melee attacks. When their health dips to 40%, each eye transforms. Retinazer becomes a mechanical eye with a laser cannon, firing red Death Laser projectiles and ceasing its attempts to ram the player. It fires more rapidly and with higher damage, and periodically fires in quick barrages. Spazmatism transforms into a mechanical mouth that chases the player, charging with greater speed and range, and periodically spews solid streams of cursed flames.
Provided by: Fandom
What is the connection between The Twins and the Eye of Cthulhu in Terraria? toggle section
In Terraria, The Twins are essentially a more challenging, cybernetic version of the Eye of Cthulhu. They are two separate entities, Retinazer and Spazmatism, connected by a tendril. Each has its own attack pattern and life count, and both must be defeated to conquer the boss. The Twins can be summoned manually using a Mechanical Eye at night, similar to how the Eye of Cthulhu is summoned. They also have a chance to spawn naturally at dusk once a Demon or Crimson Altar has been destroyed, as long as they have not yet been defeated at least once in the game.
Provided by: Fandom

Eyes[]

There are two eyes: Retinazer and Spazmatism. Retinazer is a laser-shooting eye with a red iris; Spazmatism is a similar-textured eye, though it has a green iris. It fires green Cursed Flames.

RetinazerFirst Form
RetinazerOld-gen console version and Nintendo 3DS version
Map Icon Retinazer (first form)
Map Icon
Classic mode icon Classic
Expert mode icon Expert
Master mode icon Master
Statistics
Type
Environment
AI TypeRetinazer AI
Damage45/76/114 (melee)
4076114 (Eye Laser) [3]
Max Life20000/30000/38250
Defense10
KB Resist100%
Immune toPoisonedConfused
Drops
Coins1230
SpazmatismFirst Form
SpazmatismOld-gen console version and Nintendo 3DS version
Map Icon Spazmatism (first form)
Map Icon
Classic mode icon Classic
Expert mode icon Expert
Master mode icon Master
Statistics
Type
Environment
AI TypeSpazmatism AI
Damage50/85/127 (melee)
5088132 (Cursed Flame) [1]
Max Life23000/34500/43987
Defense10
KB Resist100%
Immune toPoisonedConfused
Inflicts debuff
Inflicts debuff
Inflicts debuff
DebuffCursed InfernoCursed Inferno
Debuff tooltipLosing life
Chance68.75% [2]
Duration2–3 seconds4–6 seconds5–7.5 seconds [2]
3–8 seconds6–16 seconds
Drops
Coins1230
RetinazerSecond Form
Retinazer (Second Form)Old-gen console version and Nintendo 3DS version
Map Icon Retinazer (second form)
Map Icon
Classic mode icon Classic
Expert mode icon Expert
Master mode icon Master
Statistics
Type
Environment
AI TypeRetinazer AI
Damage67114171 (melee)
5092138 (Death Laser)
3668102 (rapid fire) [3]
Max Life8000/2000012000/3000015300/38250 [3]
Defense20 [3]
KB Resist100%
Immune toPoisonedConfused
Drops
Coins1230
SpazmatismSecond Form
Spazmatism (Second Form)Old-gen console version and Nintendo 3DS version
Map Icon Spazmatism (second form)
Map Icon
Classic mode icon Classic
Expert mode icon Expert
Master mode icon Master
Statistics
Type
Environment
AI TypeSpazmatism AI
Damage75127190 (melee)
60108162 (Eye Fire) [1]
Max Life9200/2300013800/3450017594/43987 [1]
Defense28 [1]
KB Resist100%
Immune toPoisonedConfused
Inflicts debuff
Inflicts debuff
Inflicts debuff
DebuffCursed InfernoCursed Inferno
Debuff tooltipLosing life
Chance68.75% [2]
Duration2–3 seconds [2]
3–8 seconds
4–6 seconds [2]
6–16 seconds
5–7.5 seconds [2]
Drops
Coins1230

Attacks[]

First phase[]

  • The eyeball with the red iris, Retinazer, fires purple, high-velocity Eye Lasers. It will usually attempt to remain diagonally above the player.
  • The eyeball with the green iris, Spazmatism, fires medium velocity balls of Cursed Flame. It will usually attempt to remain horizontally in line with the player.

Both alternate between their signature ranged attacks and charging melee attack, much like the Eye of Cthulhu. Retinazer's charge attack has higher velocity but has longer periods between charges and does less charges than Spazmatism's.

Second phase[]

Each eye has a second form, which each individually reaches upon its health dipping to 40%. Retinazer transforms at 8,000 / 12,000 / 15,300 HP while Spazmatism transforms at 9,200 / 13,800 / 17,594 HP.

  • Retinazer becomes a mechanical eye with a laser cannon in its pupil, and only fires red Death Laser projectiles, ceasing its attempts to ram the player (or align with the player diagonally). It fires more rapidly and with higher damage, and periodically fires in quick barrages which does significantly less damage. The barrages become more intense and frequent the more damage Retinazer takes, eventually occurring non-stop.
    • Retinazer will, however, align horizontally with the player when firing barrages, though not as tightly as first-phase Spazmatism does. When not barraging, Retinazer will usually align vertically with the player.
  • Spazmatism becomes a mechanical mouth (similar to the Eye of Cthulhu) that chases the player, periodically spewing solid streams of cursed flames from its mouth. The flames can inflict the Cursed Inferno debuff and deal high damage. It will then charge onto the player six times with greater speed and range. It no longer attempts to align horizontally with the player.

In Expert Mode, Retinazer's laser firing becomes faster and charges cover more distance as its health depletes. Spazmatism's fireballs inflict Cursed Inferno for / 2.5× the duration. Spazmatism also charges faster in its second form.

Health in Multiplayer[]

  • In Expert and Master modes, the health of bosses depends on the number of players in multiplayer. Please enter the number of players (a whole number between 2 and 256) on your server in the input box below.

    If you don't see the input box and the Calculate button, please check if you have JavaScript enabled in your web browser (instructions for the most popular web browsers). If you're certain that JavaScript is enabled but the button and input box are still not appearing, please contact the administrators on the Terraria Wiki:Admin noticeboard.

    This calculator is synchronized with the Desktop version of Terraria: 1.4.4.9.

    Unfortunately, this script works doesn't work on mobile devices. You could switch to desktop version of the page.

  • The Twins

    Notes[]

    This content is transcluded from Mechanical bosses § Notes.

    • There is a 10*1/10 (10%) chance for a random mechanical boss the player has not defeated yet to spawn naturally at dusk.
    • When spawning naturally, a mechanical boss spawns exactly 81 seconds after the status message has appeared. Being in a layer lower than the Surface at that moment, or, in singleplayer, exiting the world during that timespan, will prevent the boss from spawning naturally.
    • It is possible to summon a mechanical boss pre-Hardmode with a summoning item brought in from another world. However, if the Wall of Flesh has not been defeated, Plantera's Bulbs will not start spawning.
    • Both eyes can drop their respective trophy when killed, regardless of which is killed first. It is possible for both trophies to drop in one battle.
    • On Old-gen console version Old-gen console version, Windows Phone version Windows Phone version, and Nintendo 3DSNintendo 3DS version version, if The Twins are summoned with a Mechanical Eye on a night when The Twins are also spawning naturally, both pairs will appear and all four eyes will be connected.

    Achievements[]

    Achievement Buckets of Bolts
    Buckets of Bolts • Defeat the three nocturnal mechanical menaces: the Twins, the Destroyer, and Skeletron Prime.
    Defeat all three Mechanical Bosses.
    Category: Slayer Slayer
    Achievement Mecha Mayhem
    Mecha Mayhem • Do battle against the Twins, the Destroyer, and Skeletron Prime simultaneously and emerge victorious.
    Defeat all three Mechanical Bosses simultaneously in a single battle.
    Category: Challenger Challenger
    Achievement Ophthalmologist
    Ophthalmologist • “You have defeated The Twins!”
    Defeat The Twins for the first time.
    Achievement Back for Second
    Back for Second • “You have defeated all the prime bosses twice!”
    Defeat all of the Mechanical bosses twice. PlayStation 3

    Tips[]

    For more elaborate strategies on defeating The Twins, including weapon and arena recommendations, see Guide:The Twins strategies.
    • Focus on defeating one eye completely first without inflicting too much damage on the other one. Battling The Twins while both are in their second form makes the battle much more difficult, especially in Expert Mode.
      • Spazmatism may be a better choice for defeating first, since its Cursed Flames are difficult to avoid without proper mobility equipment and buffs in its second phase. Retinazer is less deadly, as it cannot inflict debuffs and will not charge in its second phase, which helps the player get some distance if they are a ranger.
    • The Twins are only immune to Confused and Poisoned, so using a weapon that inflicts a debuff may be useful during the fight.
    • A good arena for this boss is simply a long, flat plane. With Lightning Boots (or better) and a ranged or magic weapon, the player can continually outrun The Twins' attacks while firing back at them.
    • In its second phase, Retinazer can only attack the player if it has an unobstructed line of sight. Hiding in a box prevents it from dealing any damage.
    • A Gravitation Potion can be an excellent method of keeping distance from the Twins, allowing them to be attacked freely.

    Trivia[]

    • Retinazer's name is a portmanteau of retina, a part of the eye, and laser. Spazmatism's name is a portmanteau of spasm, meaning to twitch uncontrollably, and astigmatism, an eye disorder.
    • Spazmatism's second form has visible bolts along either side, whereas Retinazer's second form only has them along one side.
    • The Twins are planned to get their own music, in 1.4.5, which can be found here.
    • The Twins seem to have complete heterochromia iridum (two different eye colors).
    • In its second phase, Spazmatism's Eye Fire attack functions almost identically to the Flamethrower weapon, with similar range and damage, but inflicting the Cursed Inferno debuff instead of On Fire!.
    • The Twins are the only boss with two trophies, and the only mechanical boss with more than one phase.
    • Despite inflicting it, Spazmatism is not immune to Cursed Inferno.
    • The Twins are one of three bosses with a corresponding minion (Optic Staff), the others being the Martian Saucer (Xeno Staff) and Duke Fishron (Tempest Staff).
    • Official Terraria Lore – According to the official game lore, The Twins were one of the three mechanical recreations of Cthulhu's missing organs. They are a recreation of Cthulhu's eyes.
    • The Twins seem to be bio-mechanical hybrids since they are not immune to debuffs like On Fire!, Cursed Inferno, Poisoned, or Acid Venom, even when transformed.

    BestiaryBestiary entries

    • Retinazer: "Belonging to a pair of mechanically recreated Eyes of Cthulhu, this one focuses its energy into firing powerful lasers."
    • Spazmatism: "Belonging to a pair of mechanically recreated Eyes of Cthulhu, this one chases at high speed, exhaling cursed flames."

    See also[]

    History[]

    For changes which affect all the mechanical bosses, see mechanical bosses history.
    • Desktop 1.4.0.1:
      • The Twins now use their map icons correctly. Before this, Retinazer used all first phase icons while Spazmatism used all second phase icons.
      • Decreased Spazmatism's Cursed Inferno duration to compensate for increased Cursed Inferno DPS.
      • Added the Pair of Eyeballs and the Twins Relic as Master Mode drops.
    • Desktop 1.2.3:
      • Increased Spazmatism's health to 23,000, decreased damage for both.
      • The Twins now transform at 2/5th HP, instead of at half HP.
      • Now only drop 15–30 Hallowed Bars instead of 20–35.
      • One of The Twins can no longer despawn as long as the other is still active.
    • Desktop 1.2:
      • Now have a chance to spawn naturally at dusk with the message: "This is going to be a terrible night...".
      • Will now drop 20–40 Souls of Sight instead of 20–30.
      • Health and damage for both reduced from 24,000 and 50 to 20,000 and 40, respectively.
    • Console 1.06:
      • Increased Spazmatism's health to 23,000, decreased damage for both.
      • The Twins now transform at 2/5th HP, instead of at half HP.
      • Now only drop 15–30 Hallowed Bars instead of 20–35.
      • One of The Twins can no longer despawn as long as the other is still active.
    • Console 1.02:
      • Now have a chance to spawn naturally at dusk.
      • Will now drop 20–40 Souls of Sight instead of 20–30.
      • Health and damage for both reduced from 24,000 and 50 to 20,000 and 40, respectively.
    • Mobile 1.2.11212:
      • Increased Spazmatism's health to 23,000, decreased damage for both.
      • The Twins now transform at 2/5th HP, instead of at half HP.
      • Now only drop 15-30 Hallowed Bars instead of 20–35.
      • One of The Twins can no longer despawn as long as the other is still active.
    • Mobile 1.2.6508:
      • Now have a chance to spawn naturally at dusk.
      • Will now drop 20–40 Souls of Sight instead of 20–30.
      • Health and damage for both reduced from 24,000 and 50 to 20,000 and 40, respectively.
    • 3DS-Release: Introduced with changes up to Desktop 1.2.

    References[]

    1. 1.0 1.1 1.2 1.3 Information taken from the PC version PC 1.4.0.5 source code, method AI() in Terraria.NPC.cs (under aiStyle == 31) There may be inaccuracies, as the current PC version PC version is 1.4.4.9.
    2. 2.0 2.1 2.2 2.3 2.4 2.5 Information taken from the PC version PC 1.4.0.5 source code, method StatusPlayer() in Terraria.Projectile.cs (under type == 96 || type == 101) There may be inaccuracies, as the current PC version PC version is 1.4.4.9.
    3. 3.0 3.1 3.2 3.3 Information taken from the PC version PC 1.4.0.5 source code, method AI() in Terraria.NPC.cs (under aiStyle == 30) There may be inaccuracies, as the current PC version PC version is 1.4.4.9.
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