Mechanical bosses

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Main article: Boss

The term "mechanical bosses" refers to three Hardmode bosses; The Destroyer, The Twins, and Skeletron Prime, which are grouped together under this generic term due to sharing certain characteristics: They 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. They also drop from all Hardmode enemies (except statue-spawned enemies and Meteor Heads) with a 1/2500 chance until their respective boss is defeated.

Defeating any single mechanical boss for the first time causes the following to happen:

Defeating all three mechanical bosses causes the following to happen:

Boss Spawn message Summoning item Dropped Soul type
The Destroyer The Destroyer "You feel vibrations from deep below..."
"You feel a quaking from deep underground..."
Mechanical Worm Mechanical Worm Soul of MightSoul of Might
The Twins The Twins "This is going to be a terrible night..." Mechanical Eye Mechanical Eye Soul of SightSoul of Sight
Skeletron Prime Skeletron Prime "The air is getting colder around you..."
"You feel the air getting colder around you..."Verify
Mechanical Skull Mechanical Skull Soul of FrightSoul 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 of Flesh must still be defeated in order to unlock Plantera.
  • 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.

Tips[edit | edit source]

  • In order to acquire the Hardmode ores, it is not required to destroy Altars and thus expose oneself to the risk of having a mechanical boss spawn unexpectedly. Instead, it is possible to open crates, which contain Hardmode ores and bars. Crates acquired pre-Hardmode can also be saved until Hardmode, and will still offer Hardmode rewards.
  • On the 3DS version DS version, the player can find a Drax in an Underworld Shadow Chest, allowing the player to acquire Turtle armor before defeating any of the mechanical bosses, making it much easier to defeat them on the first try.
  • On the Old-gen console version Old-gen console version and 3DS version DS version, it is possible to obtain a Terra Blade after defeating a single mechanical boss. Note that several Broken Hero Swords from a Solar Eclipse will be required, however.
  • As long as the respective mechanical boss has not been defeated, its summoning item can be farmed in events with a high number of enemies, such as the Pirate Invasion or Goblin Army.

Trivia[edit | edit source]

  • All of the mechanical bosses seem to shoot a red death laser when in at least one of their forms.
  • Official Terraria Lore – According to the official game lore, the mechanical bosses are likely the parts of Cthulhu which the Mechanic was forced to build. This also explains the lack of a mechanical counterpart of the Brain of Cthulhu, as the Mechanic was not able to finish the Mechanical Brain.

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 VersionMobile 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 VersionMobile Version
Achievement Back for Second.png
Back for Second • "You have defeated all the prime bosses twice!"
Defeat all of the Mechanical bosses twice. PS3

History[edit | edit source]

See the individual mechanical bosses' articles for more specific changes.
  • Desktop 1.2.4: Fixed bug where "The jungle grows restless" message would appear before you have beaten all three mechanical bosses.
  • Desktop 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 summoning item 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.