The TwinsHardmode exclusive
Classic
Expert
MasterStatistics
| Type | |
|---|---|
| KB Resist | 100% |
| Immune to |  |
Drops
| Coins | 12 |
|---|
- Item (Quantity)Rate
Soul of Sight (20-40 / 25-40)100%- Greater Healing Potion (5-15)100%
- Hallowed Bar (15-30 / 20-35)100%
- 14.29%
- 10%
- 10%
- 14.29%
- Treasure Bag
(The Twins)
"This is going to be a terrible night..." 
The Twins are a Hardmode Mechanical Boss which is essentially a harder version of the Eye of Cthulhu. The Twins are two separate flying entities 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 are summoned using the Mechanical Eye at night, and must be defeated before dawn, otherwise they despawn. If an Altar has been destroyed, they also have a 10% chance of spawning each night until the boss is defeated. In that case, their approach is signaled at dusk via the chat message, "This is going to be a terrible night..."
While The Twins are alive, music Boss 2 will play.
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.
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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.
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Attacks
- Retinazer: has a red iris and fires purple lasers. It will usually attempt to remain diagonally above the player.
- Spazmatism: has a lime iris and fires balls of Cursed Flame. It will usually attempt to remain horizontally in line with the player.
Both alternate between their signature attacks and a charging melee attack, much like the Eye of Cthulhu. Retinazer's charge attack is faster and covers a bit more distance than Spazmatism's charge attack.
Each eye has a second form. Retinazer transforms at 8000 HP while Spazmatism transforms at 9000 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 doing significantly less damage. The barrages become more intense and frequent the more damage Retinazer takes, eventually occurring nonstop. In its second form, Retinazer will only shoot at the player and no longer attempt to ram into them or align diagonally with them.
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.
In Expert mode, Retinazer's laser firing becomes faster and charges become farther as its health depletes. Spazmatism's fireballs inflict Cursed Inferno for sixteen seconds instead of eight. Spazmatism will also charge faster in its second form.
Eyes
SpazmatismSecond Form
Map Icon
Classic Expert MasterStatistics
| Type | |
|---|---|
| AI Type | Spazmatism AI |
| Damage | 60 / 108 (eye fire) 75 / 127 (melee) |
| Max Life | 9000/23000 13500/34500 |
| Defense | 28 |
| Debuff |  Cursed Inferno |
|---|---|
| Debuff tooltip | Losing life |
| Chance | 50% |
Achievements
Buckets of Bolts • “Defeat the three nocturnal mechanical menaces: the Twins, the Destroyer, and Skeletron Prime.”
Defeat all three Mechanical Bosses.
Category: Slayer
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
Challenger
Ophthalmologist • “You have defeated The Twins!”
Defeat The Twins for the first time.
Notes
- Similar to the Eye of Cthulhu, The Twins will not spawn if you log out or move underground after the message "This is going to be a terrible night..." is displayed.
- On Console and Mobile versions, 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. This does not happen on the PC version.Verify
- 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 while all players are dead. The battle can still be completed for the boss's loot, provided that someone respawns near the remaining eye before it disappears.
Tips
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 mode
. - Try to beat Spazmatism 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.
- Because Souls of Sight are used mainly for making magic based items, this boss is less rewarding to Ranged or Melee players.
- The Sharanga
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's possible to make one of them despawn. This allows you to only have to fight one of the two Twins, and will often be Spazmatism due to its fast charges.
Trivia
- 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.
- 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 hybrid. Unlike the other two, 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 the 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 Saucer (the Xeno Staff) and Duke Fishron (the Tempest Staff).
- The Old-gen console version achievement appears to depict the second form of the Eye of Cthulhu rather than The Twins.
- Both twins have a seperate defeat message and the first one killed has a chance to drop the twins mask, doubling the chances of getting one each fight.
- The Twins seem to have central heterochromia, as well as mismatched eye colors.
See also
History
For changes that affect all the mechanical bosses, see Mechanical Bosses#History.
- Desktop 1.3.5: Sprites updated.
- Desktop 1.3.0.1: Added Expert mode drop, Mechanical Wheel Piece.
- Desktop 1.2.3:
- Spazmatism increased health to 23000, decreased damage for both.
- Spazmatism now transforms at 9000HP and Retinazer now transforms at 8000HP, instead of at half HP.
- Now only drops 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 reduced from 24000 and 50 to 20000 and 40 respectively.
- Desktop 1.1: Introduced.
- Console-Release: Introduced.
- Mobile 1.1.5536: Introduced.
- 3DS-Release: Introduced.
Characters (List):
Pre-Hardmode Enemies
Common Enemies
- Anomura Fungus
- Antlion
- Bat
- Bee
- Blood Crawler
- Crab
- Crimera
- Demon Eye
- Devourer
- Eater of Souls
- Face Monster
- Fungi Bulb
- Giant Worm
- Granite Elemental
- Granite Golem
- Harpy
- Hoplite
- Hornet
- Jellyfish
- Man Eater
- Meteor Head
- Mushi Ladybug
- Piranha
- Skeleton ()
- Shark (
- Orca
-
- Slime
- Snatcher
- Snow Flinx
- Tomb Crawler
- Undead Viking
- Vulture
- Wall Creeper
- Zombie
Uncommon Enemies
Hardmode Enemies
Common Enemies
- Angler Fish
- Angry Trapper
- Arapaima
- Armored Skeleton
- Armored Viking
- Bat
- Black Recluse
- Blood Feeder
- Chaos Elemental ()
- Clinger
- Corruptor
- Derpling
- Digger
- Floaty Gross
- Gastropod ()
- Giant Fungi Bulb
- Giant Tortoise (
- Ice
-
- Herpling
- Ice Elemental
- Ichor Sticker
- Icy Merman
- Jellyfish
- Jungle Creeper
- Moss Hornet
- Pigron
- Pixie
- Possessed Armor
- Skeleton Archer
- Slime
- Unicorn
- Wandering Eye
- Werewolf
- Wraith
- Wolf
Uncommon Enemies
Event Enemies
Vortex
Stardust
Removed NPCs
Bosses
Pre-Hardmode
Critters
Terrestrial
Aerial
Friendly NPCs
Pre-Hardmode
Removed NPCs
Familiars
- Alien Skater
- Baby Dinosaur
- Baby Eater
- Baby Face Monster
- Baby Grinch
- Baby Hornet
- Baby Imp
- Baby Ogre
- Baby Penguin
- Baby Red Panda
- Baby Skeletron Head
- Baby Snowman
- Baby Truffle
- Baby Werewolf
- Black Cat
- Bunny
- Cursed Sapling
- Destroyer-Lite
- Dynamite Kitten
- Eater of Worms
- Estee
- Everscream Sapling
- Eyeball Spring
- Fennec Fox
- Flying Piggy Bank
- Glittery Butterfly
- Hoardragon
- Honey Bee
- Ice Queen
- Itsy Betsy
- Lil' Harpy
- Lizard
- Mini Minotaur
- Mini Prime
- Moonling
- Parrot
- Phantasmal Dragon
- Plantera Seedling
- Plantero
- Puppy
- Propeller Gato
- Rez and Spaz
- Sapling
- Shadow Mimic
- Shark Pup
- Skeletron Jr.
- Slime Prince
- Slime Princess
- Spider
- Spider Brain
- Squashling
- Sugar Glider
- Suspicious Eye
- Tiki Spirit
- Turtle
- Tiny Fishron
- Void Bag
- Volt Bunny
- Zephyr Fish
- Bat
- Guinea Pig
- Slime
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