Mechanical Bosses

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The Mechanical Bosses are three Hardmode Bosses that can be summoned by "Mechanical" items, and are themselves metallic and robotic in appearance. In addition, there is a 10% chance that one will randomly spawn each night after the first Demon/Crimson Altar is destroyed in a world, and each will continue to spawn randomly until it is defeated at least once.

The Mechanical Bosses' summoning items can be crafted at a Hardmode Anvil. Each also drop from all Hardmode enemies (except statue-spawned enemies and Meteor Heads) with a 1/2500 chance until their respective boss is defeated.

Once any single Mechanical Boss has been defeated for the first time:

Defeating all three triggers the status message "The jungle grows restless...", and Plantera's Bulbs begin spawning in the Underground Jungle. The breaking of these is required to summon Plantera, which is required to have the ability to enter the Jungle Temple. Desktop VersionConsole Version This will also cause Mothrons and Reapers to spawn in the Solar Eclipses.

Boss Spawn Message Summoning Item Soul Type
The Destroyer.png The Destroyer "You feel vibrations from deep below..." or "You feel a quaking from deep underground..." Mechanical Worm.png Mechanical Worm Soul of Might.pngSoul of Might
The Twins.png The Twins "This is going to be a terrible night..." Mechanical Eye.png Mechanical Eye Soul of Sight.pngSoul of Sight
Skeletron Prime.png Skeletron Prime "You feel the air getting colder around you..."Old-gen console versionMobile Version3DS version or "The air is getting colder around you..."Desktop VersionConsole Version Mechanical Skull.png Mechanical Skull Soul of Fright.pngSoul of Fright

Summoning Items Recipes[edit | edit source]

The Destroyer[edit | edit source]

The Twins[edit | edit source]

Skeletron Prime[edit | edit source]

Notes[edit | edit source]

  • Bringing the Mechanical Bosses’ summoning items to a pre-Hardmode world makes it possible to defeat them prior to defeating the Wall of Flesh. However, the Wall must still be defeated in order to unlock Plantera.

Tips[edit | edit source]

  • Players who aren't confident in their ability to defeat the bosses, but who want access to the Hardmode Ores, can refrain from destroying any Altars until they are ready and instead fish for Crates, which offer those ores and their bars as random rewards during Hardmode. Crates acquired pre-Hardmode can also be saved until Hardmode, and will still offer Hardmode rewards.
  • Once one of the spawning messages appears at random, fleeing underground, or logging out and back in again, can prevent the Mechanical Bosses from spawning.
  • On the Mobile version Mobile version and 3DS version 3DS version, the player can find a Drax in an Underworld Shadow Chest, allowing the player to get Turtle armor before defeating any of the Mechanical Bosses, making it much easier to defeat them on the first try.

Trivia[edit | edit source]

  • Some teasers for the Mobile version Mobile version release included The Destroyer having blue-lit segments instead of red.

Achievements[edit | edit source]

Achievement Buckets of Bolts.png Buckets of Bolts • "Defeat the three nocturnal mechanical menaces: the Twins, the Destroyer, and Skeletron Prime."
Defeat all three Mechanical Bosses.Desktop VersionConsole Version
Achievement Mecha Mayhem.png Mecha Mayhem • "Do battle against the Twins, the Destroyer, and Skeletron Prime simultaneously and emerge victorious."
Defeat all three Mechanical Bosses simultaneously in a single battle.Desktop VersionConsole Version
Trophy Back for Second.png Back for Second • "You have defeated all the prime bosses twice!"
Defeat all of the Mechanical Bosses twice.Old-gen console version

History[edit | edit source]

See the individual mechanical boss articles for more specific changes.
  • Desktop 1.2.4: Fixed bug where "The jungle grows restless" message would appear before you have beaten all 3 Mech Bosses.
  • Desktop Mech bosses no longer spawn randomly if another boss is alive. You can still summon multiple bosses manually.
  • Desktop 1.2.1: Reduced the chance for a mechanical boss summon to drop during hardmode.
  • Desktop
    • Hardmode Crimson, Corruption, and Hallow spread is now slowed after killing Plantera instead of any Mechanical Boss.
    • Slightly increased the chance for a Solar Eclipse to happen, but they will now only happen after killing a Mechanical Boss.
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High Velocity Bullet.png Ammunition • Jungle Grass Seeds.png Seeds • Fallen Star.png Materials ( Feather.png Drops • Copper Ore.png Ores • Iron Bar.png Bars) • Silver Coin.png Other

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