The Twins

The TwinsHardmode exclusive

 Classic

 Expert

 Master

Statistics

Type	Boss
Environment	Surface + Night Space + Night
Max Life	430006450082237 (total)
Defense	10
KB Resist	100%
Immune to

Drops

Coins	12 GC30 GC

• Item (Quantity)Rate
• Soul of Sight (25-40)
  100%
• Hallowed Bar (15–30)
  100%
• Horned God Boots(Old-gen console version)
  14.29%
• Greater Healing Potion (5–15)
  100%
• Twin Mask
  14.29%
• Treasure Bag(Desktop, Console and Mobile versions)(The Twins)
  100%
• Mechanical Wheel Piece(Desktop, Console and Mobile versions)
  100%
• Twin Mask
  14.29%
• Soul of Sight (25–40)
  100%
• Hallowed Bar (20–35)
  100%
• Gold Coin (12)
  100%
• Pair of Eyeballs(Desktop, Console and Mobile versions)
  25%
• Twins Relic(Desktop, Console and Mobile versions)
  100%

Sounds

Hurt
Killed
Hurt (mechanical)

"This is going to be a terrible night..."

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 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, Console 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

Map Icon

 Classic

 Expert

 Master

Statistics

Type	Boss
Environment	Surface + Night Space + Night
AI Type	Retinazer AI
Damage	45/76/114 (contact) 4076114 (Eye Laser)
Max Life	20000/30000/38250
Defense	10
KB Resist	100%
Immune to

Drops

Coins	12 GC30 GC

Sounds

Hurt
Killed
Eye Laser
Entering second phase

• Internal NPC ID: 125

SpazmatismFirst Form

Map Icon

 Classic

 Expert

 Master

Statistics

Type	Boss
Environment	Surface + Night Space + Night
AI Type	Spazmatism AI
Damage	50/85/127 (contact) 5088132 (Cursed Flame)
Max Life	23000/34500/43987
Defense	10
KB Resist	100%
Immune to

Inflicts debuff

Inflicts debuff

Inflicts debuff

Debuff	Cursed Inferno
Debuff tooltip	Losing life
Chance	68.75%
Duration	2–3 seconds (Desktop, Console and Mobile versions) 3–8 seconds (Old-gen console and 3DS versions)4–6 seconds 5–7.5 seconds

Drops

Coins	12 GC30 GC

Sounds

Hurt
Killed
Entering second phase

• Internal NPC ID: 126
• Internal Buff ID: 39

RetinazerSecond Form

Map Icon

 Classic

 Expert

 Master

Statistics

Type	Boss
Environment	Surface + Night Space + Night
AI Type	Retinazer AI
Damage	67114171 (contact) 5092138 (Death Laser) 3668102 (rapid fire)
Max Life	8000/2000012000/3000015300/38250
Defense	20
KB Resist	100%
Immune to

Drops

Coins	12 GC30 GC

• Item (Quantity)Rate
• Retinazer Trophy
  10%

Sounds

Hurt
Killed
Death Laser

• Internal NPC ID: 125

SpazmatismSecond Form

Map Icon

 Classic

 Expert

 Master

Statistics

Type	Boss
Environment	Surface + Night Space + Night
AI Type	Spazmatism AI
Damage	75127190 (contact) 60108162 (Eye Fire)
Max Life	9200/2300013800/3450017594/43987
Defense	28
KB Resist	100%
Immune to

Inflicts debuff

Inflicts debuff

Inflicts debuff

Debuff	Cursed Inferno
Debuff tooltip	Losing life
Chance	68.75%
Duration	2–3 seconds (Desktop, Console and Mobile versions) 3–8 seconds (Old-gen console and 3DS versions)4–6 seconds 5–7.5 seconds

Drops

Coins	12 GC30 GC

• Item (Quantity)Rate
• Spazmatism Trophy
  10%

Sounds

Hurt
Killed
Charge

• Internal NPC ID: 126
• Internal Buff ID: 39

Behavior

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, which have a 11/16 (68.75%) chance of inflicting the Cursed Inferno debuff for 2–3 / 4–6 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 visage before beginning to attack the player after a few seconds. Retinazer transforms at 8,000 / 12,000 / 15,300 HP while Spazmatism transforms at 9,200 / 13,800 / 17,594 HP. During their second phase, the defense of each eye is also increased to 20.

• 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 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 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 seconds. Spazmatism no longer attempts to align itself horizontally with the player.

In Expert Mode(Desktop, Console and Mobile versions), Retinazer's laser-firing becomes faster and its charges cover more distance as its health depletes. Spazmatism's flames inflict Cursed Inferno for 2× / 2.5× the duration while also charging faster in its second form.

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.
• 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.
• Both eyes can drop their respective trophy when killed, regardless of which is killed first. It is also possible for both trophies to drop in one battle.
• On the  Old-gen console version and Nintendo 3DS 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 appear connected.

Two pairs of The Twins that spawned.

Achievements

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

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

Slayer of Worlds • “Defeat every boss in Terraria.”

Defeat every boss in the game. (Desktop, Console and Mobile versions)

Category:  Challenger

Ophthalmologist • “You have defeated The Twins!”

Defeat The Twins for the first time. (Old-gen console version)

Back for Second • “You have defeated all the prime bosses twice!”

Defeat all of the mechanical bosses twice.

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 get some distance if they are a ranger.
• The Twins are only immune to Confused and (Desktop, Console and Mobile versions) 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 ((Old-gen console and 3DS versions)), 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(Desktop, Console and Mobile versions) (Xeno Staff(Desktop, Console and Mobile versions)) and Duke Fishron (Tempest Staff).
•  – 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, (Old-gen console and 3DS versions) Poisoned, or Acid Venom, even when transformed.

Bestiary 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

• The Destroyer
• Skeletron Prime
• Mechdusa
• Twins of Terror at the Don't Starve Wiki

History

For changes which affect all the mechanical bosses, see mechanical bosses history.

 Desktop version

• Desktop 1.4.1.2: Now immune to Poisoned.

• 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. 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.

• Desktop 1.3.0.1: Added the Mechanical Wheel Piece as an Expert Mode drop.

• 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.

• Desktop 1.1: Introduced.

 Console version

• Console 1.0.933.1: Added the Mechanical Wheel Piece as an Expert Mode drop. ()

• Console 1.0.750.0: Added the Mechanical Wheel Piece as an Expert Mode drop. ()

• 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.

• Console-Release: Introduced.

 Nintendo Switch version

• Switch 1.0.711.6: Introduced with changes up to Desktop 1.3.0.1.

 Mobile version

• 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.

• Mobile 1.1.5536: Introduced.

Nintendo 3DS version

• 3DS-Release: Introduced with changes up to Desktop 1.2.