The Twins

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The Twins
The Twins.png
Statistics
TypeBoss
KB Resist100%
Immune toConfused
Drops
Coins12 Gold Coin

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. They can also spawn naturally upon dusk with a chance of 10% once a Demon or Crimson Altar has been smashed, as long as they have not yet been defeated in the current world. If spawning this way, their arrival is announced by the status message: "This is going to be a terrible night...". They must always be killed before dawn, otherwise, they will despawn.

While The Twins are alive, music Boss 2 will play.

Eyes[edit | edit source]

RetinazerFirst Form
Retinazer.png
Statistics
TypeEnemy
AI TypeRetinazer AI
Damage45 / 76 (melee)
40 / 76 (eye laser)
Max Life20000 / 30000
Defense10
KB Resist100%
Immune toConfused
Drops
Coins 12 Gold Coin
Map Icon Retinazer (first form).png
Map Icon
SpazmatismFirst Form
Spazmatism.png
Statistics
TypeEnemy
AI TypeSpazmatism AI
Damage50 / 85 (melee)
50 / 88 (cursed flame)
Max Life23000 / 34500
Defense10
KB Resist100%
Inflicts debuffCursed InfernoCursed Inferno
50% chance

Debuff duration16% for 8 / 16 seconds,
then 25% for 5 / 10 seconds,
then 50% for 3 / 6 seconds
Debuff tooltipLosing life
Immune toConfused
Drops
Coins 12 Gold Coin
Map Icon Spazmatism (first form).png
Map Icon
RetinazerSecond Form
Retinazer (Second Form).png
Statistics
TypeEnemy
AI TypeRetinazer AI
Damage50 / 92 (death laser)
36 / 68 (rapid fire)
67 / 113 (melee)
Max Life8000/20000
12000/30000
Defense20
Map Icon Retinazer (second form).png
Map Icon
SpazmatismSecond Form
Spazmatism (Second Form).png
Statistics
TypeEnemy
AI TypeSpazmatism AI
Damage60 / 108 (eye fire)
75 / 127 (melee)
Max Life9200/23000
13800/34500
Defense28
Inflicts debuffCursed InfernoCursed Inferno
50% chance

Debuff duration16% for 8 / 16 seconds,
then 25% for 5 / 10 seconds,
then 50% for 3 / 6 seconds
Debuff tooltipLosing life
Map Icon Spazmatism (second form).png
Map Icon

Attacks[edit | edit source]

  • The eyeball with the red iris, Retinazer, fires purple lasers. It will usually attempt to remain diagonally above the player.
  • The eyeball with the lime iris, Spazmatism, fires balls of Cursed Flame. It will usually attempt to remain horizontally in line with the player.

Both alternate between their signature ranged attacks and a charging melee attack, much like the Eye of Cthulhu. Retinazer's charge attack is faster but covers a little bit less distance than Spazmatism's charge attack.

Each eye has a second form which they transform to upon reaching 40% of their maximum health. Retinazer transforms at 8000 / 12000 HP while Spazmatism transforms at 9200 / 13800 HP.

  • Retinazer becomes a mechanical eye with a laser turret in its pupil. It fires more rapidly and with higher damage, and periodically fires in quick barrages, but does significantly less damage. The barrages become more intense and frequent the more damage Retinazer takes, eventually occurring non-stop. In its second form, Retinazer will only shoot at the player and no longer attempt to ram into them or align diagonally with them.
    • Desktop VersionConsole VersionMobile Version Retinazer will, however, align horizontally with the player when firing barrages, though not as tightly as first-phase Spazmatism does.
  • Spazmatism becomes a mechanical mouth. It chases the player, charging with greater speed and range, and periodically spews streams of Cursed Flames from its mouth in a manner similar to the Flamethrower. The flames can inflict the Cursed Inferno debuff and deal high damage. In its second form, Spazmatism will no longer attempt to align horizontally with the player.

Desktop VersionConsole VersionMobile Version In Expert mode, Retinazer's laser firing becomes faster and charges become farther as its health depletes. Spazmatism's fireballs inflict Cursed Inferno for double the duration. Spazmatism will also charge faster in its second form.

Notes[edit | edit source]

  • Because Souls of Sight are used mainly for making magic-based items, this boss can be less rewarding to ranged and melee players (though it is still a prerequisite for Plantera, and by extension, the endgame).
  • When spawning naturally, The Twins spawn 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 Twins from spawning naturally.
  • On Old-gen console version Old-gen console version and 3DS version DS version, if The Twins are summoned with a Mechanical Eye in a night where The Twins naturally spawn, both pairs will appear and all four eyes will be connected.
  • Both eyes can drop their respective trophy when killed, regardless of which is killed first or last. It is possible to get both trophies in one battle.
  • The Twins are defeated when the last eye alive is killed. In multiplayer, it is possible that only one of the two eyes despawn when all players are dead. The battle can still be completed for the boss's loot, provided that a player respawns near the remaining eye before it disappears.

Tips[edit | edit source]

For more elaborate strategies on defeating The Twins, including weapon and arena recommendations, see Guide:The Twins strategies.

  • In both of The Twins' second form, using items like a Cross Necklace or having Titanium armor greatly helps take less damage by becoming invincible during most of their strong "rapid attacks".
  • Try to defeat one of the Twins at a time. Having both in their second forms at near equal health will prove dangerous to any player, especially in Expert modeDesktop VersionConsole VersionMobile Version.
    • Spazmatism should be defeated first, since its cursed flames are difficult to avoid in its second form. Retinazer is less deadly, cannot inflict debuffs and will not charge in its second form. It is also easier to outrun Retinazer and therefore get away from it quicker.
  • The SharangaOld-gen console version3DS Version is an excellent weapon against The Twins if it is fired as the player runs away.
  • If The Twins are outran, such as with the case of a long railroad, it is possible to make one of them despawn.Verify This leaves the player to fight only one eyeball; often Spazmatism due to its fast charges.
  • If the player has one, a Daedalus Stormbow with Holy Arrows can be a great tactic, as it can deal massive amounts of damage while staying out of range of Spazmatism’s Cursed Inferno spray and other attacks.

Trivia[edit | edit source]

  • Retinazer's name is a portmanteau of retina, a part of the eye, and laser. Spazmatism's name is a portmanteau of astigmatism, an eye disorder, and spasm, meaning to twitch uncontrollably.
  • The Twins seem to have central heterochromia iridum.
  • In its second form, Spazmatism's eye fire 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 mechanical boss with phases, and the only mechanical boss that seems to be partially made of flesh, possibly being biomechanical hybrids. Unlike the other two mechanical bosses, however, they are vulnerable to more debuffs.
  • Despite inflicting it, Spazmatism is not immune to Cursed Inferno.
  • They are the only boss with two trophies.
  • Although The Twins spawn off-screen, the tendril between them can appear in the screen.
  • The Twins are one of three bosses with a minion designed after it (the Optic Staff), the others being the Martian SaucerDesktop VersionConsole VersionMobile Version (the Xeno StaffDesktop VersionConsole VersionMobile Version) and Duke Fishron (the Tempest Staff).
  • The Old-gen console version Old-gen console achievement appears to depict the second form of the Eye of Cthulhu rather than The Twins.
  • Mobile version Both twins have a separate defeat message and the first one killed has a chance to drop the Twin Mask, doubling the chances of getting one each fight.

Achievements[edit | edit source]

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 VersionConsole VersionMobile Version
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 VersionConsole VersionMobile Version
Achievement Ophthalmologist.png
Ophthalmologist • "You have defeated The Twins!"
Defeat The Twins for the first time. Old-gen console version

See also[edit | edit source]

History[edit | edit source]

For changes which affect all the mechanical bosses, see mechanical bosses history.
  • Desktop 1.2.3:
    • Increased Spazmatism's health to 23000, decreased damage for both.
    • The Twins now transform at 2/5th HP, instead of at half HP.
    • Now only drop 15-30 Hallowed Bars.
    • 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 during hardmode 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 24000 and 50 to 20000 and 40, respectively.
  • Console 1.06:
    • Increased Spazmatism's health to 23000, decreased damage for both.
    • The Twins now transform at 2/5th HP, instead of at half HP.
    • Now only drop 15-30 Hallowed Bars.
    • 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 during Hardmode.
    • Will now drop 20-40 Souls of Sight instead of 20-30.
    • Health and damage for both reduced from 24000 and 50 to 20000 and 40, respectively.
  • Mobile 1.2.11212:
    • Increased Spazmatism's health to 23000, decreased damage for both.
    • The Twins now transform at 2/5th HP, instead of at half HP.
    • Now only drop 15-30 Hallowed Bars.
    • 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 during Hardmode.
    • Will now drop 20-40 Souls of Sight instead of 20-30.
    • Health and damage for both reduced from 24000 and 50 to 20000 and 40, respectively.
  • 3DS-Release: Introduced with changes up to Desktop 1.2.