The Twins

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

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..."

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 it's 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 Inferno debuff and deal high damage.

Tips

 * 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.

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 Hardmode Mechanical Boss with phases, and is also the only mechanical boss that seems to be partially made of flesh, possibly being biomechanical hybrid.
 * In the console and mobile versions of Terraria, there is an error in the summoning message. It says: "The Twins has awoken!" instead of "The Twins have awoken!" This is fixed in update 1.3

History

 * 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.

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