Mechanical bosses

Mechanical Boss is a term which refers to any of the three Hardmode bosses that can be summoned by "Mechanical" items, which are listed below. Once Hardmode begins, they will begin to spawn randomly until each individual one is defeated at least once.

Killing a Mechanical Boss will meet the requirements necessary for the Steampunker NPC to arrive and the Truffle NPC to sell the Mushroom Spear and Hammush. This will also cause Red Devils and Lava Bats to spawn in the Underworld.

After all three Mechanical bosses have been slain at least once each, the message "The jungle grows restless" will appear, and Plantera's Bulb will begin to grow in the Underground Jungle.

History
{{history|1.2.4|ASDASDASD {{history|1.2.3.1|Mech bosses no longer spawn randomly if another boss is alive. You can still summon multiple bosses manually.}} {{history|1.2.3|Mech bosses are now slightly more difficult.}} {{history|1.2.1.1|Mechanical Bosses will no longer spawn during Pumpkin Moons.}} {{history|1.2.1|Reduced the chance for a mechanical boss summon to drop during hardmode.}} {{history|1.2.0.3| {{history|1.1|Introduced.}}
 * 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.}}

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