The Twins Guide —The Mechanical Eye
| Property | Retinazer (Red Eye) | Spazmatism (Green Eye) |
|---|---|---|
| HP | 20,000 (Normal) / 36,000 (Expert) | 20,000 (Normal) / 36,000 (Expert) |
| Damage | 40 (laser, Normal) / 68 (Expert) | 50 (melee, Normal) / 85 (Expert) |
| Defense | 10 (First) / 20 (Second Phase) | 10 (First) / 25 (Second Phase) |
| KB Resistance | 100% | 100% |
| Spawn | Use Mechanical Eye at night (crafted from 5 Iron Bars + 3 Souls of Light + 3 Souls of Night) | |
Must-Know: Dawn Kills Them
Like Skeletron, The Twins must be defeated before dawn (4:30 AM). If daytime arrives, they will both enrage and instantly kill you. Start the fight as soon as night falls to have enough time —10 minutes is usually plenty with decent gear.
Preparation
- Armor: Adamantite or Titanium armor is the minimum. Frost Armor (ranged set) is a strong choice for the extra DPS.
- Weapons: Daedalus Stormbow with Holy Arrows is the most effective option. Megashark with Ichor or Crystal Bullets works well. For mages, a Golden Shower to reduce defense + a high-damage magic weapon. For melee, the Shadowflame Knife or a strong yoyo.
- Accessories: Wings (essential —you need vertical mobility), Lightning Boots, Ranger/Magic/Warrior Emblem, Star Veil, Cross Necklace if available.
- Potions: Ironskin, Regeneration, Swiftness, Endurance, and a food buff. Wrath or Rage potion if you have them.
- Arena: A long skybridge (800+ blocks) of platforms works well. Alternatively, a multi-layer platform arena about half that length. Campfires and Heart Lanterns every 100 blocks.
Kill Spazmatism First. Always.
There is no debate about which eye to kill first. Spazmatism (the green one) is the dangerous one. In second phase, he charges at you rapidly and shoots Cursed Flames that deal heavy damage and inflict the Cursed Inferno debuff. Retinazer just fires a laser —it's easy to dodge. Kill Spazmatism first, then leisurely finish Retinazer.
Strategy
Phase 1 —Both Eyes
Both eyes start in their first phase. Spazmatism floats around and sometimes charges. Retinazer stays at a distance and fires lasers. Focus all your damage on Spazmatism:
- Keep moving in one direction on your skybridge or platform arena
- Use a homing or piercing weapon to damage Spazmatism while dodging Retinazer's lasers
- The Daedalus Stormbow + Holy Arrows combo hits both eyes at once, which is helpful —just keep the cursor near Spazmatism
- You'll need to take Spazmatism from 20,000 HP to 8,000 HP to trigger his second phase
Phase 2 —Spazmatism Transforms
When Spazmatism hits 8,000 HP, he transforms: his pupil becomes a dragon head, his defense jumps to 25, and he starts charging rapidly while shooting Cursed Flames. This is the most dangerous point of the fight:
- Stay far away. The Cursed Flames have limited range. If you keep your distance, they're much easier to dodge.
- When he charges, jump and use wings to fly over him. Dropping through platforms works too.
- Don't stop moving. Standing still for even a second in this phase is how you get hit by a charge + Cursed Flame combo.
- Keep damaging Spazmatism while avoiding his charges. He has 8,000 HP in this phase, so it shouldn't take long with a good weapon.
Phase 3 —Retinazer Transforms
Once Spazmatism is dead, Retinazer transforms at 8,000 HP. His pupil becomes a red laser cannon, defense increases to 20, and he fires a continuous death laser:
- The death laser tracks you. Keep moving perpendicular to the laser direction to avoid it.
- This phase is much easier than Spazmatism's charge phase. The laser is predictable and does no debuff damage.
- Take your time —Retinazer has less DPS potential than Spazmatism even in his transformed state.
Expert Mode Changes
In Expert Mode, both eyes gain more HP and deal more damage. Spazmatism shoots more Cursed Flames per burst, and Retinazer's death laser sweeps faster. The core strategy remains the same: kill Spazmatism first, keep moving, use a long arena. Consider adding heart statues or campfires every 50 blocks instead of 100 for easier healing access.
Rewards —What's Worth Your Time
- Hallowed Bars (15-30) —Worth farming. Hallowed Bars craft Hallowed Armor, which is your best set for fighting Plantera. You also need them for Excalibur and several other endgame items. The Twins are the easiest mechanical boss to farm for these.
- Souls of Sight (20-40) —Transitional. Used for a handful of specific items (Magical Harp, Optic Staff). You won't need many —20 is usually enough for everything.
- Greater Healing Potions —Always useful. Stock up while you're farming.
- Twin Mask / Trophy (Master) —Cosmetic only.
After defeating The Twins, craft Hallowed Armor with the bars. This will help you take on The Destroyer (the easiest mechanical boss) and Skeletron Prime, then Plantera.
Related Guides
- Boss Progression Order —where The Twins fit
- Daedalus Stormbow Guide —the best weapon for this fight
- Best Weapons by Stage —early Hardmode gear