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 night time. Using another Mechanical Worm while The Destroyer is already summoned will result in the Mechanical Worm not being consumed, and a second Destroyer will not appear.

If you have not defeated The Destroyer yet and you are in Hardmode, all enemies have a 1 in 2500 (0.04%) chance of dropping this item, with the exception of statue-spawned enemies and Meteor Heads.

Achievement
Like a Boss is the achievement you earn for obtaining any boss-summoning item ( only).