The Twins

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The TwinsHardmode exclusive
Twins (first form).gif Twins (second form).gif
Classic Mode.png Classic
Expert Mode.png Expert
Master Mode.png Master
Statistics
Type
Boss
Environment
Surface + Night Space + Night
Max Life430006450082237 (total)
Defense10
KB Resist100%
Immune toPoisonedConfused
Drops
Coins12 GC30 GC
Sounds
Hurt
Killed
Hurt (mechanical)
Map Icon Retinazer (first form).png “This is going to be a terrible night...” Map Icon Spazmatism (first form).png

The Twins are a Hardmode mechanical boss which 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 health. Both must be killed in order to defeat the boss.

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

Summoning and spawning

The Twins can be summoned manually using a Mechanical Eye at night (from 7:30 PM to 4:30 AM).

They also have a 1/10 (10%) chance to spawn naturally at dusk (7:30 PM) during Hardmode 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. When spawning naturally, their arrival is announced by the status message "This is going to be a terrible night...".

The Twins must be killed before dawn (4:30 AM), otherwise they flee and despawn.

Eyes

There are two eyes: Retinazer and Spazmatism. Retinazer is a laser-shooting eye with a red iris, while Spazmatism is an eye with a green iris that shoots Cursed Flames.

RetinazerFirst Form
Retinazer (first form).gif
Map Icon Retinazer (first form).png
Map Icon
Classic Mode.png Classic
Expert Mode.png Expert
Master Mode.png Master
Statistics
Type
Boss
Environment
Surface + Night Space + Night
AI TypeRetinazer AI
Damage45/76/114 (contact)
4076114 (Eye Laser) [3]
Max Life20000/30000/38250
Defense10
KB Resist100%
Immune toPoisonedConfused
Drops
Coins12 GC30 GC
Projectile created
Projectile created
Projectile created
  • Eye Laser
    Eye Laser
Sounds
Hurt
Killed
Eye Laser
Entering second phase
SpazmatismFirst Form
Spazmatism (first form).gif
Map Icon Spazmatism (first form).png
Map Icon
Classic Mode.png Classic
Expert Mode.png Expert
Master Mode.png Master
Statistics
Type
Boss
Environment
Surface + Night Space + Night
AI TypeSpazmatism AI
Damage50/85/127 (contact)
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 seconds [2]4–6 seconds [2]5–7.5 seconds [2]
Drops
Coins12 GC30 GC
Projectile created
Projectile created
Projectile created
  • Cursed Flame (hostile)
    Cursed Flame (hostile)
Sounds
Hurt
Killed
Cursed Flame
Entering second phase
RetinazerSecond Form
Retinazer (second form).gif
Map Icon Retinazer (second form).png
Map Icon
Classic Mode.png Classic
Expert Mode.png Expert
Master Mode.png Master
Statistics
Type
Boss
Environment
Surface + Night Space + Night
AI TypeRetinazer AI
Damage67114171 (contact)
5092138 (Death Laser)
3668102 (Death Laser rapid fire) [3]
Max Life8000/2000012000/3000015300/38250 [3]
Defense20 [3]
KB Resist100%
Immune toPoisonedConfused
Drops
Coins12 GC30 GC
Projectile created
Projectile created
Projectile created
  • Death Laser
    Death Laser
Sounds
Hurt
Killed
Death Laser
SpazmatismSecond Form
Spazmatism (second form).gif
Map Icon Spazmatism (second form).png
Map Icon
Classic Mode.png Classic
Expert Mode.png Expert
Master Mode.png Master
Statistics
Type
Boss
Environment
Surface + Night Space + Night
AI TypeSpazmatism AI
Damage75127190 (contact)
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]4–6 seconds [2]5–7.5 seconds [2]
Drops
Coins12 GC30 GC
Projectile created
Projectile created
Projectile created
  • Eye Fire
    Eye Fire
Sounds
Hurt
Killed
Eye Fire
Charge

Behavior

First phase

  • The eyeball with the red iris, Retinazer, fires purple, high-velocity Eye Lasers at low accuracy. It will usually attempt to remain diagonally above the player.
  • The eyeball with the green iris, Spazmatism, fires green balls of Cursed Flames, which have a 11/16 (68.75%) chance of inflicting the Cursed Inferno debuff for 2–3 / 4–6 / 5–7.5 seconds. It will usually attempt to remain horizontally in line with the player.

Both eyes alternate between their signature ranged attacks and charging attacks, much like the Eye of Cthulhu. Retinazer charges four times while traveling much greater distances than Spazmatism at the expense of longer periods in between charges, while Spazmatism charges ten times within quick, high-velocity bursts that cover shorter distances.

Second phase

When one of the eyes' health dips below 40%, it spins before transitioning into its second form, casting off its retina to reveal its true mechanical appearance before beginning to attack the player after a few seconds. Retinazer transforms at 8,000 / 12,000 / 15,300 health while Spazmatism transforms at 9,200 / 13,800 / 17,594 health. During their second phase, the defense of each eye is also increased to 20 and 28 for Retinazer and Spazmatism respectively.

  • Retinazer becomes a mechanical eye with a laser cannon in its pupil and now only fires red Death Lasers, ceasing its attempts to ram the player (or align with the player diagonally). It fires at a higher rate, with more damage, and at pinpoint accuracy, periodically switching to a quick barrage with considerably less damage. Both normal and burst lasers are fired more quickly as its health is depleted, leading to a near-constant stream of them near the end.
    • 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 itself vertically with the player from above.
  • Spazmatism becomes a mechanical mouth (similar to the Eye of Cthulhu's second phase) that continuously pursues the player. It alternates between charging at the player six times with increased speed and range, and spewing Eye Fire from its mouth in the form of a continuous stream of Cursed Flames while slowly approaching the player for approximately seven seconds, in a manner similar to the Flamethrower. The stream of Cursed Flames also has a 11/16 (68.75%) chance of inflicting the Cursed Inferno debuff for 2–3 / 4–6 / 5–7.5 seconds. Spazmatism no longer attempts to align itself horizontally with the player.

In Expert Mode(Desktop, Console and Mobile versions), both eyes fire faster and charge greater distances in their first phases as their health is depleted, and their cursed fireball and eye laser projectiles have 16.7% higher velocity. In their second phases, Retinazer's barrages scale much more aggressively with health and its slower death laser barrages have 17.6% higher velocity, and Spazmatism has a much shorter delay between individual charges.

Notes

This content is transcluded from Mechanical bosses § Notes.

  • When spawning naturally, a mechanical boss spawns exactly 81 in-game minutes (at 8:51 PM) 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 1/10 (10%) chance of spawning naturally at dusk, the resulting chance for each mechanical boss is initially 1/30 (3.33%). Once one of them has been defeated, the remaining two have a resulting 1/20 (5%) chance of spawning naturally, and after defeating the second one, the last one has the full chance of 1/10 (10%).
  • An Eye of Cthulhu naturally spawning will take precedence over a mechanical boss naturally spawning.[4]
  • A Lantern Night(Desktop, Console and Mobile versions) occurring will prevent a mechanical boss from naturally spawning. However, summoning a mechanical boss using one of the summon items will cancel out the Lantern Night, just like any other boss summon.
  • In a Get fixed boi(Desktop, Console and Mobile versions) world, the player cannot summon the mechanical bosses separately, they have to summon the Mechdusa instead.
  • It is possible to summon a mechanical boss in 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.
  • Killing both eyes is required for the boss to collectively drop all of its loot, including dropped Hearts. Thus, killing one of the eyes will not drop any Hearts.
  • Both eyes can drop their respective trophy when killed, regardless of which is killed first. It is also possible (1/100 (1%) chance) for both trophies to drop in one battle.
Two pairs of The Twins that spawned.
  • In single player The Twins can only despawn if both of their despawn timers reaches 0 at the same time, which causes them to despawn together, however in multiplayer it is possible for them to despawn separately.
    • This can be exploited by timing 2 players' deaths such that one twin despawns, then a player respawns, allowing for an easier battle with only one twin.

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)
Category: Slayer Slayer
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)
Category: Challenger Challenger
Achievement Slayer of Worlds.png
Slayer of Worlds • “Defeat every boss in Terraria.”
Defeat every boss in the game. (Desktop, Console and Mobile versions)
Category: Challenger Challenger

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(Desktop, 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 attack it from a safe distance with ranged attacks.
    • In its first phase, Retinazer's accuracy is low enough that it will simply miss most shots against a stationary player. If Spazmatism is already defeated, even moderately tanky builds can maximize DPS for less effort by staying put, except to dodge charges.
  • 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 that creates blurry or distorted vision.
  • 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).
  • 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(Desktop, Console and Mobile versions) (Xeno Staff(Desktop, Console and Mobile versions)) and Duke Fishron (Tempest Staff).
  • Terraria lore pages – According to the Terraria lore pages, 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, or Acid Venom, even when transformed.
  • The Twins make an appearance in Don't Starve Together as the Twins of Terror, the harder version of the original Eye of Terror. However, unlike in Terraria, Retinazer is known as "Retinazor," they can both spawn minions, do not fire any projectiles, and can charge towards players in both phases.

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 both first phase icons while Spazmatism used both second phase icons.
    • Decreased Spazmatism's Cursed Inferno duration to compensate for increased Cursed Inferno DPS. The debuff can now last for 3 / 6 / 7.5 seconds (chance of 6/16 (37.5%)), 2 / 4 / 5 seconds (5/16 (31.25%)), or not be inflicted at all (5/16 (31.25%)). Previous durations were 8 / 16 seconds (chance of 8/48 (16.67%)), 5 / 10 seconds (10/48 (20.83%)), 3 / 6 seconds (15/48 (31.25%)), or not being inflicted at all (15/48 (31.25%)).
    • Added the Pair of Eyeballs and the Twins Relic as Master Mode drops.
  • Desktop 1.3.5: Sprites updated.
    • Old sprites for Retinazer were: Retinazer (old).png Retinazer (Second Form) (old).png.
    • Old sprites for Spazmatism were: Spazmatism (old).png Spazmatism (Second Form) (old).png.
  • 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 1.4.4.9 source code, method AI() in Terraria.NPC.cs. The relevant part is the aiStyle == 31 block.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Information taken from the Desktop version Desktop 1.4.4.9 source code, method StatusPlayer() in Terraria.Projectile.cs. The relevant part is the type == 96 || type == 101 block.
  3. ↑ 3.0 3.1 3.2 3.3 Information taken from the Desktop version Desktop 1.4.4.9 source code, method AI() in Terraria.NPC.cs. The relevant part is the aiStyle == 30 block.
  4. ↑ Information taken from the Desktop version Desktop 1.4.3.6 source code, method UpdateTime() in Terraria.Main.cs. There may be inaccuracies, as the current Desktop version Desktop version is 1.4.4.9.
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