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Mechanical Eye

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v544Mechanical Eye
Item 544
Type Item
Sub-Type Summoner
Max Stack 20
Consumable Yes
Quality Tier 3 (Orange)
Tooltip Summons Twins
Summons The Twins
Dropped By all hardmode mobs. (Excluding bosses)
Sell Value No Value
Material In Suspicious Looking Skull(Console Only)
Crafted With 5 Iron Bars / 5 Lead Bars
3 Lens
6 Souls of Light
Crafted At Mythril Anvil
Orichalcum Anvil
The Mechanical Eye is a consumable item that summons the boss The Twins. To craft this you need to combine 3 Lenses, 5 Lead Bars or 5 Iron Bars and 6 Souls of Light at a Mythril Anvil.

The Mechanical Eye will summon The Twins anywhere in both pre-hard mode and Hard mode worlds, but must be used at Night.

As of 1.2, this item has a small chance of dropping from any enemy entity in Hard Mode worlds. The drop chance is 1:2500.

Mechanical Eye Terraria HERO(02:09)


  • The Twins are sometimes known to not appear after being summoned. (This is a very common bug on Multiplayer servers, but this could also be caused by an anti-boss spawning system used on a lot of servers)
  • On rare occasions if The Twins are spawned using the Mechanical Eye and the player teleports far enough from the boss only one of the "Eyes" may return thus leaving only one of them to fight against.
  • If you attempt to use the Mechanical Eye (or the other mechanical summoning items) at dusk, the item will not be used (which is supposed to happen) but when that night begins the respective boss will spawn naturally. This is a way to summon the hard mode bosses without using the item.
  • If summoned in caves, only one eye may appear.
  • Sometimes only one eye will spawn.
  • If summoned from high altitudes, The Twins may not appear.
The mechanical eye summons the twins, as shown above.

Update Info


  • The drop chance was decreased from 1:1000 to 1:2500.


  • Added recipes.
  • The Mechanical Eye can be obtained by killing Hardmode enemies.


  • Added to the game.

Items Requiring Copper
Tools Copper Pickaxe · Copper Axe · Copper Hammer
Armor Copper Helmet · Copper Chainmail · Copper Greaves
Weapons Copper Shortsword · Copper Broadsword · Copper Bow
Accessories Depth Meter · Copper Watch
Other Copper Bar · Mechanical Eye · Mechanical Worm · Mechanical Skull
Items Requiring Iron
Tools Grappling Hook · Iron Axe · Iron Hammer · Iron Pickaxe
Armor Iron Helmet · Iron Chainmail · Iron Greaves
Furniture Bathtub · Chest · Cooking Pot · Lamp Post · Toilet · Barrel · Trash Can · Iron Door
Weapons Iron Bow · Iron Broadsword · Iron Shortsword · Flamethrower
Crafting Stations Iron Anvil · Sawmill
Other Iron Bar · Iron Chain · Empty Bucket · Inlet Pump Outlet Pump · Mechanical Eye · Mechanical Skull · Mechanical Worm

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