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

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

The Twins are a Hardmode mechanical boss which is 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 Desktop and Mobile versions is enabled, the track Boss 2 (Otherworldly) will play instead.

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
Retinazer.png
Map Icon Retinazer (first form).png
Map Icon
Classic mode icon.png Classic
Expert mode icon.png Expert
Master mode icon.png 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
Spazmatism.png
Map Icon Spazmatism (first form).png
Map Icon
Classic mode icon.png Classic
Expert mode icon.png Expert
Master mode icon.png 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 Desktop and Mobile versions [2]
3–8 seconds6–16 seconds Console and Old-gen console versions 3DS version
Drops
Coins1230
RetinazerSecond Form
Retinazer (Second Form).png
Map Icon Retinazer (second form).png
Map Icon
Classic mode icon.png Classic
Expert mode icon.png Expert
Master mode icon.png 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).png
Map Icon Spazmatism (second form).png
Map Icon
Classic mode icon.png Classic
Expert mode icon.png Expert
Master mode icon.png 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 Desktop and Mobile versions [2]
3–8 seconds Console and Old-gen console versions 3DS version
4–6 seconds Desktop and Mobile versions [2]
6–16 seconds Console Version
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.
    • Desktop, Console, and Mobile versions 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, charging with greater speed and range, and periodically spews Eye Fire from its mouth, streams of Cursed Flames, in a manner similar to the Flamethrower. The flames can inflict the Cursed Inferno debuff and deal high damage. It no longer attempts to align horizontally with the player.

In Expert ModeDesktop, Console, and Mobile versions, 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.

Notes[]

This content is transcluded from Mechanical bosses § Notes.

  • 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.
  • With the 10*1/10 (10%) chance of spawning naturally at dusk, the resulting chance for each mechanical boss is initially 3.33*1/30 (3.33%). Once one of them has been defeated, the remaining two have a resulting 5*1/20 (5%) chance of spawning naturally, and after defeating the second one, the last one has the full chance of 10*1/10 (10%).
  • It is possible to summon a mechanical boss pre-Hardmode if the summoning item is 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 and 3DS3DS 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.png
Buckets of Bolts • Defeat the three nocturnal mechanical menaces: the Twins, the Destroyer, and Skeletron Prime.
Defeat all three Mechanical Bosses. Desktop, Console, and Mobile versions
Achievement Mecha Mayhem.png
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. Desktop, Console, and Mobile versions
Achievement Ophthalmologist.png
Ophthalmologist • “You have defeated The Twins!”
Defeat The Twins for the first time. Old-gen console version

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 ModeDesktop, Console, and Mobile versions.
    • 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 Desktop version 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 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 SaucerDesktop, Console, and Mobile versions (Xeno StaffDesktop, Console, and Mobile versions) 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, Console VersionOld-gen console versionMobile version3DS version 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 Desktop version Desktop 1.4.0.5 source code, method AI() in Terraria.NPC.cs (under aiStyle == 31) There may be inaccuracies, as the current Desktop version Desktop version is 1.4.2.3.
  2. 2.0 2.1 2.2 2.3 2.4 2.5 Information taken from the Desktop version Desktop 1.4.0.5 source code, method StatusPlayer() in Terraria.Projectile.cs (under type == 96 || type == 101) There may be inaccuracies, as the current Desktop version Desktop version is 1.4.2.3.
  3. 3.0 3.1 3.2 3.3 Information taken from the Desktop version Desktop 1.4.0.5 source code, method AI() in Terraria.NPC.cs (under aiStyle == 30) There may be inaccuracies, as the current Desktop version Desktop version is 1.4.2.3.