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The Twins

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The Twins
The Twins.png
Statistics
Type
Environment
KB Resist100%
Immune toConfused
Sounds

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. Retinazer is usually the one which is defeated last because it is usually harder to hit thanks to its lasers.

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

The Twins must be killed before dawn, otherwise they fly up and then despawn.

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

Eyes[edit | edit source]

RetinazerFirst Form
Retinazer.png
Statistics
Type
Environment
AI TypeRetinazer AI
Damage45 / 76 (melee)
40 / 76 (eye laser)
Max Life20000 / 30000
Defense10
KB Resist100%
Immune toConfused
Drops
Coins120000*12 Gold Coin.png
Map Icon Retinazer (first form).png
Map Icon
SpazmatismFirst Form
Spazmatism.png
Statistics
Type
Environment
AI TypeSpazmatism AI
Damage50 / 85 (melee)
50 / 88 (cursed flame)
Max Life23000 / 34500
Defense10
KB Resist100%
Immune toConfused
Inflicts debuff
DebuffCursed InfernoCursed Inferno
Debuff tooltipLosing life
Chance50%
Duration16% for 8 / 16 seconds,
then 25% for 5 / 10 seconds,
then 50% for 3 / 6 seconds
Drops
Coins120000*12 Gold Coin.png
Map Icon Spazmatism (first form).png
Map Icon
RetinazerSecond Form
Retinazer (Second Form).png
Statistics
Type
Environment
AI TypeRetinazer AI
Damage67 / 113 (melee)
50 / 92 (death laser)
36 / 68 (rapid fire)
Max Life8000/20000
12000/30000
Defense20
Sounds
Map Icon Retinazer (second form).png
Map Icon
SpazmatismSecond Form
Spazmatism (Second Form).png
Statistics
Type
Environment
AI TypeSpazmatism AI
Damage75 / 127 (melee)
60 / 108 (eye fire)
Max Life9200/23000
13800/34500
Defense28
Inflicts debuff
DebuffCursed InfernoCursed Inferno
Debuff tooltipLosing life
Chance50%
Duration16% for 8 / 16 seconds,
then 25% for 5 / 10 seconds,
then 50% for 3 / 6 seconds
Map Icon Spazmatism (second form).png
Map Icon

Attacks[edit | edit source]

First phase[edit | edit source]

  • The eyeball with the red iris, Retinazer, fires high velocity red 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 covers slightly less distance than Spazmatism's.

Second phase[edit | edit source]

Each eye has a second form, which each individually reaches upon its health dipping to 40%. Retinazer transforms at 8000 / 12000 HP while Spazmatism transforms at 9200 / 13800 HP.

  • Retinazer becomes a mechanical eye with a laser cannon in its pupil, and only fires 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, but 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.
  • Spazmatism becomes a mechanical mouth (similar to the Eye of Cthulhu) that 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. 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 double the duration. Spazmatism also charges faster in its second form.

Notes[edit | edit source]

  • When spawning randomly, The Twins spawn exactly 81 seconds after the status message has appeared. Being in a layer lower than the surface, or exiting the world (in singleplayer), will prevent The Twins from spawning randomly.
  • On Old-gen console version Old-gen console version and 3DS version 3DS version, if The Twins are summoned with a Mechanical Eye on a night when The Twins are also spawning randomly, 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. It is possible for both trophies to drop in one battle.

Tips[edit | edit source]

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 doing too much damage to 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/buffs in its second form. Retinazer is less deadly, as it cannot inflict debuffs and will not charge in its second form, which helps the player get some distance if they are a ranger.
  • A Cross Necklace helps during The Twins' second form, as players will take far less damage during barrage attacks.
  • The Twins are only immune to Confused, 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 and a ranged weapon, the player can continually outrun The Twins' attacks while firing back at them.
  • The SharangaOld-gen console version3DS Version is an excellent weapon against The Twins if it is fired as the player runs away.
  • 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 many of The Twins' attacks.
  • The Shadowflame Knife can be great for melee players, as it does not require any ammo or mana, and can hit both eyes if aimed correctly.
  • Retinazer's second form can not attack the player if he/she is hiding in a box. Defeating Spazmatism then causing Retinazer to reach its second form can become an almost guaranteed win if this strategy is used.
  • A gravitation potion can be an excellent method of keeping distance from the twins allowing them to be attacked freely.

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 spasm, meaning to twitch uncontrollably, and astigmatism, an eye disorder.
  • Unlike Spazmatism, Retinazer’s second form has no visible bolts the left side.
  • The Twins seem to have complete heterochromia iridum (two different eye colors).
  • In its second form, Spazmatism's fire stream 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 phases.
  • 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).
  • In Master mode, The Black Spot mount travels faster than The Twins, allowing the player to run away and fire backwards for the entirety of the fight, thus making it fairly straightforward.
  • 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.

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, 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

See also[edit | edit source]

History[edit | edit source]

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 uses all 1st form icons while Spazmatism using all 2nd form icons.
  • 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.