The Mechanical Worm is a consumable item that summons The Destroyer. It can only be obtained by a first-time player once Hard Mode has been activated. If it is not a first-time player, it can be used to summon The Destroyer anywhere in both pre-Hard Mode and Hard Mode worlds, but must be used at night. It is usually recommended to wait until the very beginning of night to use the Mechanical Worm, as it may take quite a length of time to defeat The Destroyer.