Mechanical bosses

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Main article: Bosses

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, resembling mechanical versions of the pre-Hardmode bosses Eater of Worlds, Skeletron, and Eye of Cthulhu. 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:

  • The status message "The jungle grows restless..." appears.
  • Desktop, Console, and Mobile versions Plantera's Bulbs begin spawning in the Underground Jungle, allowing the boss to be summoned.
  • Desktop, Console, and Mobile versions Reapers and Console VersionMobile version Mothrons now spawn during Solar Eclipses.
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..."
Mechanical Skull Mechanical Skull Soul of FrightSoul of Fright

Crafting[edit | edit source]

Summoning Items Recipes[edit | edit source]

Notes[edit | edit source]

  • It is possible to summon a mechanical boss pre-Hardmode if the summoning items are brought in from another world. However, if the Wall of Flesh has not been defeated, Plantera's Bulbs will not start spawning.
  • Once one of the spawning messages appears at random, fleeing to the underground, or logging out and back in again, can prevent the mechanical boss 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. As of 1.4, crates acquired pre-Hardmode will no longer give Hardmode rewards.
  • On the 3DS version 3DS 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 3DS version, it is possible to obtain a Terra Blade after defeating a single mechanical boss. Note that three Broken Hero Swords (As opposed to two) 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.
  • Desktop, Console, and Mobile versions They are the only bosses whose Expert-exclusive items are crafting materials.
  • 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 explains the lack of a mechanical counterpart of the Brain of Cthulhu, as the mechanical Cthulhu lacks a brain and the Mechanic was never able to finish it.
  • It seems that all mechanical bosses are made of hallowed bars since they drop them once destroyed.
  • Hallowed Bars, dropped by the mechanical bosses, are the one of the only bars that don't have a corresponding ore, the others being Spectre Bars and Shroomite Bars.
  • The Twins are the only mechanical bosses with no visible mechanical attachments until Retinazer's 2nd phase.

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, Console, and Mobile versions
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, Console, and Mobile versions
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.