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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
Tooltip Summons Twins
Summons The Twins
Dropped By All mobs in hardmode world(excluding statue-spawned mobs and Meteor Heads), so long as The Twins have not been defeated on that world yet.
Drop Rate 0.04% (1:2500)
Sell Value No Value
Crafted With 5 Iron Bars / 5 Lead Bars
3 Lens
6 Souls of Light
Crafted At Mythril Anvil
Orichalcum Anvil
Material In Icon mobile Icon xbox360 Icon ps3 Suspicious Looking Skull

The Mechanical Eye is a consumable item that summons the boss 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.

Mechanical Eye Terraria HERO02:09

Mechanical Eye Terraria HERO


  • 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)
  • If one attempts 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.
  • 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


  • Sprite change.


  • 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 Axe · Copper Hammer · Copper Pickaxe
Armor Copper Helmet · Copper Chainmail · Copper Greaves
Weapons Amethyst Staff · Copper Shortsword · Copper Broadsword · Copper Bow
Accessories Copper Watch
Other Copper Bar · Copper Brick · Copper Plating
Items Requiring Iron
Tools Chain · Iron Axe · Iron Hammer · Iron Pickaxe
Weapons Flamethrower · Iron Bow · Iron Broadsword · Iron Shortsword
Armor Iron Helmet · Iron Chainmail · Iron Greaves
Potions Ironskin Potion
Crafting Stations Cooking Pot · Glass Kiln · Heavy Work Bench · Iron Anvil · Sawmill
Furniture Barrel · Bathtub · Blacksmith Rack · Blue Dungeon Chest · Bone Chest · Bone Clock · Boreal Wood Chest · Boreal Wood Clock · Cactus Chest · Cactus Clock · Carpentry Rack · Chest · Dynasty Bathtub · Dynasty Chest · Dynasty Clock · Ebonwood Chest · Ebonwood Clock · Flesh Chest · Flesh Clock · Frozen Clock · Glass Chest · Glass Clock · Grandfather Clock · Green Dungeon Chest · Helmet Rack · Honey Chest · Honey Clock · Iron Door · Iron Fence · Lamp Post · Living Wood Clock · Lihzahrd Clock · Mushroom Chest · Mushroom Clock · Obsidian Chest · Palm Wood Chest · Palm Wood Clock · Pearlwood Chest · Pearlwood Clock · Pink Dungeon Chest · Pumpkin Chest · Pumpkin Clock · Rich Mahogany Chest · Rich Mahogany Clock · Shadewood Chest · Shadewood Clock · Slime Chest · Slime Clock · Spear Rack · Spooky Chest · Spooky Clock · Steampunk Chest · Steampunk Clock · Sunplate Clock · Sword Rack · Toilet · Trash Can
Other Empty Bucket · Inlet Pump · Iron Bar · Mechanical Eye · Mechanical Skull · Mechanical Worm · Minecart Track · Outlet Pump

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