Terraria – How to kill The Twins In Terraria

The Twins are, in my opinion, the toughest of the mechanical bosses (though the Destroyer is much tougher than it used to be). As such, I tend to take them on last. Here are a few strategies that I use to defeat them:

Arena

Set up a line (or lines) of wooden platforms in the air that you can jump up to and down from. The benefit of platforms over regular blocks is that ranged attacks can pass through them. I typically set up one arena for the all of the mechanical bosses: three levels of platforms, spaced about 20 blocks apart. Make sure you have campfires, heart lanterns, and wire up a heart statue (if you can find one) to four pressure plates (this will give you 4 hearts of healing every 10 seconds!).

Gear

I prefer using the Megashark with crystal bullets, as the splash damage from the crystal bullets helps tremendously. Chlorophyte bullets are another very useful option, thanks to their homing capability.

Wings are a must, as are either Spectre or Lightning boots; being able to move fast is key. An Obsidian Shield is very helpful, as are a Star Veil and a Charm of Myths.

Adamantite or Titanium armor at the very minimum. Hallowed armor is even better. Since I like using the Megashark, I typically go for the ranged helmet type, so I get the range damage bonus. I believe the Hallowed armor even has a chance to not consume ammo, which is very important.

Stock up on potions: iron skin, thorns, regeneration, swiftness, bowls of soup, and heart-reach. Greater healing potions are very useful at this stage.

Battle

Focus on Spazmatism first; he's the more difficult of the two by far (has more defense and more life). Simply fly around, kiting the boss as possible. Again, moving fast is key. The first phase is easiest; once he transforms into the second stage, you've got to keep your distance! His flamethrower-like attack does a tremendous amount of damage, so avoid it at all costs. I personally fly in a figure-eight pattern, kiting him and keeping my distance, relying on my wings to float through the air. My platforms allow me to continue firing, and give me a chance to land to reset my wing's flight time.

Once Spasmatizm is down, do the same thing for Retinazer. Kite, keep your distance, and plug away with the Megashark. Ranged damage is your friend because you can keep your distance. The Retinazer fight is way easier once Spasmatizm is down.

And don't forget to quaff your healing potions during the fight! The heart statue will really help, if you can find one. +80 health every 10 seconds is never a bad thing.