Mechanical Eye

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, which means 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 you have not defeated The Twins yet and are already in Hardmode, all enemies (with the exception of statue-spawned enemies) have a 1/2500 (0.04%) chance of dropping this item.

Trivia

 * The Mechanical Eye is the only mechanical item with no visible winder.

History
Œil mécanique 기계식 눈