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	1230

• Item (Quantity)Rate
• Soul of Sight (25-40)
  100%
• Hallowed Bar (15–30)
  100%
• Horned God Boots
  14.29%
• Greater Healing Potion (5–15)
  100%
• Twin Mask
  14.29%
• Treasure Bag(The Twins)
  100%
• Mechanical Wheel Piece
  100%
• Twin Mask
  14.29%
• Soul of Sight (25–40)
  100%
• Hallowed Bar (15–30)
  100%
• Gold Coin (12)
  100%
• Pair of Eyeballs
  25%
• Twins Relic
  100%

Sounds

Hurt
Killed
Hurt (Mechanical)

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

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

Quick Answers

What are the names of the two entities that make up The Twins in Terraria?

The Twins in Terraria are made up of two individual entities known as Retinazer and Spazmatism.

Provided by: Fandom

How can The Twins be summoned in Terraria?

In Terraria, The Twins can be summoned using a Mechanical Eye. However, they can also spawn naturally once a Demon or Crimson Altar has been destroyed, as long as they haven't been defeated at least once in the current world. If they spawn this way, their arrival is announced by the status message 'This is going to be a terrible night...'. Remember, The Twins must be defeated before dawn, otherwise they will flee and despawn.

Provided by: Fandom

What does 'This is going to be a terrible night' signify for The Twins in Terraria?

In Terraria, the phrase 'This is going to be a terrible night' signals the arrival of The Twins, a Hardmode mechanical boss. This status message appears when The Twins are about to spawn, adding a sense of dread and anticipation to the game. The Twins are a more difficult version of the Eye of Cthulhu and must be defeated before dawn, otherwise, they will flee and despawn. So, when you see 'This is going to be a terrible night', prepare for a challenging battle!

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What are the attack patterns of Retinazer and Spazmatism in Terraria?

In Terraria, The Twins, Retinazer and Spazmatism, have unique attack patterns. Retinazer, the eyeball with the red iris, fires high-velocity Eye Lasers and usually tries to stay diagonally above the player. Spazmatism, the eyeball with the green iris, fires medium velocity balls of Cursed Flame and typically tries to stay horizontally in line with the player. Both alternate between their signature ranged attacks and charging melee attacks. When their health dips to 40%, each eye transforms. Retinazer becomes a mechanical eye with a laser cannon, firing red Death Laser projectiles and ceasing its attempts to ram the player. It fires more rapidly and with higher damage, and periodically fires in quick barrages. Spazmatism transforms into a mechanical mouth that chases the player, charging with greater speed and range, and periodically spews solid streams of cursed flames.

Provided by: Fandom

What is the connection between The Twins and the Eye of Cthulhu in Terraria?

In Terraria, The Twins are essentially a more challenging, cybernetic version of the Eye of Cthulhu. They are two separate entities, Retinazer and Spazmatism, connected by a tendril. Each has its own attack pattern and life count, and both must be defeated to conquer the boss. The Twins can be summoned manually using a Mechanical Eye at night, similar to how the Eye of Cthulhu is summoned. They also have a 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 game.

Provided by: Fandom

Eyes[]

There are two eyes: Retinazer and Spazmatism. Retinazer is a laser-shooting eye with a orange 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 (melee) 4076114 (Eye Laser) [3]
Max Life	20000/30000/38250
Defense	10
KB Resist	100%
Immune to

Drops

Coins	1230

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 (melee) 5088132 (Cursed Flame) [1]
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% [2]
Duration	2–3 seconds4–6 seconds5–7.5 seconds [2] 3–8 seconds6–16 seconds

Drops

Coins	1230

Sounds

Hurt
Killed
Entering Second Phase

• Internal NPC ID: 126

RetinazerSecond Form

Map Icon

 Classic

 Expert

 Master

Statistics

Type	Boss
Environment	Surface + Night Space + Night
AI Type	Retinazer AI
Damage	67114171 (melee) 5092138 (Death Laser) 3668102 (rapid fire) [3]
Max Life	8000/2000012000/3000015300/38250 [3]
Defense	20 [3]
KB Resist	100%
Immune to

Drops

Coins	1230

• Item (Quantity)Rate
• Retinazer Trophy
  10%

Sounds

Death Laser

SpazmatismSecond Form

Map Icon

 Classic

 Expert

 Master

Statistics

Type	Boss
Environment	Surface + Night Space + Night
AI Type	Spazmatism AI
Damage	75127190 (melee) 60108162 (Eye Fire) [1]
Max Life	9200/2300013800/3450017594/43987 [1]
Defense	28 [1]
KB Resist	100%
Immune to

Inflicts debuff

Inflicts debuff

Inflicts debuff

Debuff	Cursed Inferno
Debuff tooltip	Losing life
Chance	68.75% [2]
Duration	2–3 seconds [2] 3–8 seconds 4–6 seconds [2] 6–16 seconds 5–7.5 seconds [2]

Drops

Coins	1230

• Item (Quantity)Rate
• Spazmatism Trophy
  10%

Sounds

Charge

Attacks[]

First phase[]

• The eyeball with the orange 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.
  • 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, periodically spewing solid streams of cursed flames from its mouth. The flames can inflict the Cursed Inferno debuff and deal high damage. It will then charge onto the player six times with greater speed and range. 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 2× / 2.5× the duration. Spazmatism also charges faster in its second form.

Health in Multiplayer[]

Notes[]

This content is transcluded from Mechanical bosses § Notes.

• There is a 10*1/10 (10%) chance for a random mechanical boss the player has not defeated yet to spawn naturally at dusk.
• 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.

• It is possible to summon a mechanical boss pre-Hardmode with a summoning item 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,  Windows Phone 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 be connected.

Achievements[]

Buckets of Bolts • “Defeat the three nocturnal mechanical menaces: the Twins, the Destroyer, and Skeletron Prime.”

Defeat all three Mechanical Bosses.

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.

Category: Challenger

Ophthalmologist • “You have defeated The Twins!”

Defeat The Twins for the first time.

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

Defeat all of the Mechanical bosses twice.

Tips[]

• 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.
  • 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 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.
  • Controllable weapons like the Daedalus Stormbow, Flying Knife and Meteor Staff prove useful against Retinazer to finish it off.
• 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 are planned to get their own music, in 1.4.5, which can be found here.
• 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 Saucer (Xeno Staff) and Duke Fishron (Tempest Staff).
•  – 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, 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
• Twins of Terror at the Don't Starve Wiki

History[]

 PC 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.
  • 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.

References[]