Mechanical Eye

Type	Boss summonCrafting material
Consumable	✓
Use time	45 (Very slow)
Tooltip	Summons The Twins
Rarity
Research	3 required
Use	https://terraria.fandom.com/wiki/File:Roar_0.wav

The Mechanical Eye is used to summon The Twins, the advanced and Hardmode version of the Eye of Cthulhu. It can only be used at night; using this item during the day will not spawn The Twins or consume it. Using another Mechanical Eye while the The Twins are active will not cause any additional effects, and will not be consumed. If The Twins have not been defeated yet in a Hardmode world, all enemies have a 0.04*1/2500 (0.04%) chance of dropping this item, with the exception of statue-spawned enemies, Meteor Heads, and Old One's Army enemies.

Crafting[]

Recipes[]

Result	Ingredients	Crafting station
Mechanical Eye	Lens (3) Any Iron Bar (5) Soul of Light (6)	Mythril Anvil or Orichalcum Anvil

Used in[]

Result	Ingredients	Crafting station
Suspicious Looking Skull ()	Mechanical Skull Mechanical Eye (2) Adamantite Bar (10) Soul of Night (5) Soul of Light (5)	Mythril Anvil or Orichalcum Anvil
Suspicious Looking Skull ()	Mechanical Skull Mechanical Eye (2) Adamantite Bar or Titanium Bar (10) Soul of Night (5) Soul of Light (5)	Mythril Anvil or Orichalcum Anvil

Notes[]

Like other mechanical boss-summoning items, the Mechanical Eye can be brought to pre-Hardmode worlds and will successfully summon The Twins there.
As with several items, the Mechanical Eye has multiple crafting recipes (two in total) due to some items in the recipe allowing substitutes.