Mechanical Worm

The Mechanical Worm is a Hardmode item used to summon The Destroyer, the Hardmode version of the Eater of Worlds. It can only be used during the night; attempting to use it during the day will neither summon the boss nor consume the item. Using another Mechanical Worm while The Destroyer is already summoned has no effect. If The Destroyer has not been defeated yet in a Hardmode world, all enemies have a chance of dropping this item, with the exception of statue-spawned enemies, Meteor Heads, and Old One's Army enemies.

Trivia

 * There used to be a minor grammatical error in the item's tooltip: It previously said "Summons Destroyer" instead of "Summons The Destroyer". In the, this mistake was never present.