The Twins (one of the three Mechanical Bosses) are the Hardmode 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. They also have a chance of spawning on a random night once Hardmode begins, if they have not been defeated yet. Their approach is signaled at dusk via the chat message, "This is going to be a terrible night..."
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.
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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.
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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 an orange-red iris and fires purple lasers. It will usually attempt to remain vertically above the player.
Spazmatism has a green iris and fires balls of Cursed Flame. It will usually attempt to remain horizontally inline with the player.
Both alternate between their signature attacks and a charging melee attack, much like 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 phase. Retinazer transforms at 8000HP, while Spazmatism transforms at 9000HP.
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. The barrages become more intense the more damage Retinazer takes. In its second form, Retinazer will only shoot at the player(s) and no longer attempt to ram into them.
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 Infernodebuff and deal high damage.
In Expert mode, Retinazer's laser firing become faster and charges become farther as his health goes down.
If The Twins are summoned with a Mechanical Eye on a night where The Twins naturally spawn, 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 or last. It is possible to get both trophies in one battle.
In its second form, Spazmatism's eye fire functions almost identically to the Flamethrower weapon, with similar range and damage but inflicting the Cursed Infernodebuff instead of On Fire!.
In its first form, Spazmatism's flame shots often miss, even if the player isn't moving. The same goes for Retinazer's lasers in its second form.
Concentrate on killing Spazmatism completely first. Fighting them both in their second phases simultaneously makes the fight significantly more difficult.
Both of the Twins are vulnerable to the Frostburn and Ichor debuffs.
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"
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.
The Twins are the only HardmodeMechanical Boss with phases, and is also the only mechanical boss that seems to be partially made of flesh, possibly being biomechanical hybrid.