Mechanical bosses

See also: Boss

Mechanical Boss is a term which refers to any of the three Hardmode bosses that can be summoned by "Mechanical" items which (besides being craftable) drop in hardmode until the respective boss is defeated. These items are listed below. Besides being summoned, there is a 10% chance that one will be spawned each night after the first Demon/Crimson Altar is destroyed. They will continue to spawn randomly until each individual one is defeated at least once, the only condition being destruction of a single Altar.

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

• The Steampunker will arrive if there is a house available.
• The Truffle will begin selling the Mushroom Spear and Hammush.
• Solar Eclipses can occur.
• Red Devils and Lava Bats will spawn in the Underworld.
• Yelets can be dropped by any enemy in a Jungle biome and Underground corruption/hallow.
• Life Fruit will begin to grow in the Underground Jungle.

After all three Mechanical bosses have been slain (Only one needed in the Console/Mobile versions), the message "The jungle grows restless" will appear, and Plantera's Bulb will begin to grow in the Underground Jungle.

Boss	Spawn Message	Summoning Item	Soul Type
The Destroyer	"You feel vibrations from deep below..."	Mechanical Worm	Soul of Might
The Twins	"This is going to be a terrible night..."	Mechanical Eye	Soul of Sight
Skeletron Prime	"The air is getting colder around you..."	Mechanical Skull	Soul of Fright

Crafting

The Destroyer

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The Twins

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Skeletron Prime

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Tips

• If you aren't confident in your ability to defeat the bosses, but you want access to the hardmode metals, you can refrain from destroying any Altars until you are ready and instead get the ores/bars from fishing up crates. Crates may yield hardmode metals once hardmode is reached.
• In the same line of thought, you may want to refrain from opening crates until hardmode, as the hardmode ores are more valuable.
• Another option is to flee underground or log out and back in again once one of the messages appears. This prevents the boss from spawning, though they can still be manually summoned underground.

History

See the individual mechanical boss articles for more specific changes.

• 1.2.4: Fixed bug where "The jungle grows restless" message would appear before you have beaten all 3 Mech Bosses.

• 1.2.3.1: Mech bosses no longer spawn randomly if another boss is alive. You can still summon multiple bosses manually.

• 1.2.3: Mech bosses are now slightly more difficult.

• 1.2.1.1: Mechanical Bosses will no longer spawn during Pumpkin Moons.

• 1.2.1: Reduced the chance for a mechanical boss summon to drop during hardmode.

• 1.2.0.3:
  • Hardmode Crimson, Corruption, and Hallow spread is now slowed after killing Plantera instead of any Mechanical Boss.
  • Slightly increased the chance for an Eclipse to happen, but they will now only happen after killing a Mechanical Boss.

• 1.1: Introduced.

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