The Twins

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The Twins
The Twins.png
Type Boss
Knockback Resist 100%
Coins 10 Gold Coin
Item (Quantity) Rate
Soul of Sight.png Soul of Sight (20-40) 100%
Greater Healing Potion.png Greater Healing Potion (5-15) 100%
Hallowed Bar.png Hallowed Bar (15-35) 100%
Twin Mask.png Twin Mask 14.29%Pc only.png
Retinazer Trophy.png Retinazer Trophy 10%
Spazmatism Trophy.png Spazmatism Trophy 10%
For strategies on defeating The Twins, see Guide:The Twins Strategies.

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

The Twins are a Hardmode Boss (one of the three Mechanical Bosses) that are 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. 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..."


  • Retinazer has a red iris and fires purple eye lasers.
  • Spazmatism has a green iris and fires balls of Cursed Flame.

Both alternate between their signature attacks and a charging melee attack, much like Eye of Cthulhu. Retinazer's charge dash is faster and covers a bit more distance than Spazmatism's charge dash.

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.
  • Spazmatism becomes a mechanical mouth. It chases the player, dashing 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.


Retinazer (First Form)
AI Type Retinazer AI
Damage 20 eye laser
45 melee
Max Life 20000
Defense 10
Spazmatism (First Form)
AI Type Spazmatism AI
Damage 25 cursed flame
50 melee
Max Life 23000
Defense 10
Retinazer (Second Form)
Retinazer (Second Form).png
AI Type Retinazer AI
Damage 25 death laser
20 death laser (rapid fire)
45 melee
Max Life 8000/20000
Defense 25
Spazmatism (Second Form)
Spazmatism (Second Form).png
AI Type Spazmatism AI
Damage 30 eye fire

50 melee
Max Life 9000/23000
Defense 35


  • Unlike the Eye of Cthulhu, the twins gain defense when they take on their second form.
  • In his first form, Spazmatism's flame shots often miss, even if the player isn't moving. The same goes for Retinazer's laser bolts in his second form.
  • Both of the Twins are vulnerable to the Frostburn debuff.
  • The Cursed Flames fired by Spazmatism travel slower in honey.
  • 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 his 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 the On Fire!.
  • The Twins are said to be the hardest mechanical boss, along with Skeletron Prime, unlike the Eye of Cthulhu, which most likely be the first boss you encounter.
  • The Twins are by far the most mobile hardmode boss.


  • Concentrate on killing one eye first. Getting them both to their second phase at the same time makes the fight significantly more difficult.
  • If you have The Crimson in your world, use something that inflicts the Ichor (debuff) to significantly reduce the Twins' defense.
  • Retinazer is by far the easier of the Twins to hit. A combination of the Rocket Boots, Wings, a Shiny Red Balloon, and/or the Cloud in a Balloon can make keeping up with him quite easy. Using a high-DPS sword like the True Night's Edge or a ranged weapon like the Megashark can kill Retinazer completely in under 45 seconds.
  • Due to the fact that the Twin’s main attacks are melee, it is suggested to use a ranged approach
  • A long flat surface with Spectre Boots equipped is suggested for easy dodging of attacks. Combined with wings, you are able to soar through the air dodging attacks that would (in other circumstances) eventually catch up to you.
  • The Star Veil/Cross Necklace are also a good thing to have around in case the Twins happen to get in close combat with you.
  • See Guide:The Twins Strategies for more tips on defeating The Twins.


  • 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 is the only Hardmode Mechanical Boss encounter with phases.

See also[edit]


Bug.png Bug : Occasionally, when summoned with the Mechanical Eye, both may not appear. This is confirmed to happen in Multiplayer and Singleplayer.
Anomaly.png Anomaly: If the Twins are too far apart, the tendril connecting them may randomly disappear, only returning when the twins get closer to each other.
Anomaly.png Anomaly: The twins deal double damage to players in their second form. Confirmed on Mobile only.png Mobile Edition.
Anomaly.png Anomaly: (needs to be confirmed) The Twins lose their defence when transforming to their next form, making it advantageous to strike them then.
Bug.png Bug : If one of the Twins go above the height limit, it may despawn. This leaves one twin to fight, making things easier. Confirmed with Retinazer on Mobile only.png Mobile Edition.
Bug.png Bug : If you summon The Twins and teleport far enough, one of the eyes can disappear, leaving one eye to fight. This may also happen when you die.
Bug.png Bug : Sometimes if the twins are not defeated before dawn after they run away they will get stuck around the area become invisible and both will fire lasers at you, only known fix is to reload your world.
Bug.png Bug : Sometimes both twins can drop Souls of Sight, resulting in the player getting twice the amount of Souls.
Bug.png Bug : On rare occasion, one of the Twins will disappear instead of changing forms.
Bug.png Bug : Sometimes when "This going to be a terrible night..." appears, The Twins may not spawn.
Bug.png Bug : Sometimes The Twins will not enter their second form until their health is lower than it should need to be.
Bug.png Bug : Sometimes when Retinazer is killed just before dawn and Spazmatism is not it will give both the message it has been defeated and fled but will only drop hallowed bars.
Bug.png Bug : If you manage to kill one of the twins at the exact time that the night ends, the other shall die too, counting as if it was killed normally.
Bug.png Bug Sometimes you will not get Souls of Sight from defeating The Twins. (Only reported on PC)
Bug.png Bug : Sometimes, if you kill them before dawn, the boss music can continue.
Bug.png Bug : Mobile only.png Rarely, Spazmatism will transform early.
Bug.png Bug : Mobile only.png If two players are at different areas when the twins spawn they might separate and come for the other player
Bug.png Bug : Like Skeletron Prime, if The Twins are summoned when a player goes through a hellevator and reaches hell first before they spawn, only one twin will often come
Bug.png Bug : One Twin may randomly despawn instead of transforming. (Mobile only.png Reported with Retinazer)


For changes that affect all the mechanical bosses, see Mechanical_Bosses#History.
  • 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
  • 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.
  • 1.1: Introduced.
Characters: Blue Slime.png Pre-Hardmode Enemies • Pixie.png Hardmode Enemies • Goblin Warrior.png Event Enemies • Skeletron Head.png Bosses
Bunny.png Critters • Guide.png Friendly NPCs • Baby Dinosaur.png Familiars