The Twins

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"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..."

Attacks

 * 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.

Tips

 * Concentrate on killing one eye completely 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, using something that inflicts the Ichor (debuff) to almost completely eliminate any defense The Twins may have is a great way to take care of them.
 * 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.

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 is the only Hardmode Mechanical Boss encounter with phases.

Bugs
{{Bug| Sometimes one eye will despawn after you die and spawn far away, then you only have to fight the other to defeat it. {{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| 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| Sometimes you will not get Souls of Sight from defeating The Twins. (Only reported on PC)| 1.2.3.1}} {{Bug| Sometimes, if you kill them before dawn, the boss music can continue }} {{Bug| {{console icon}} When Spazmatism changes to its second form, Retinazer may suddenly disappear, leaving only Spazmatism to fight.}}

History
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