- See also: Boss
The 机械 Boss are three 困难模式 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 祭坛 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 can also drop from any Hardmode enemy (except statue-spawned 敌怪 and 流星头s), with a 1/2500 chance, until their respective boss is defeated.
Once any single Mechanical Boss has been defeated for the first time:
- The 蒸汽朋克人 will arrive (if a vacant 房屋 is available).
- The 松露人 will begin selling the 蘑菇长矛 and 蘑菇锤.
- 日食s can occur.
- 红魔鬼s and 熔岩蝙蝠s spawn in the 地狱.
- 叶列茨球 can be dropped by any enemy in the 丛林 and 地下腐化之地/地下神圣之地 biomes.
- 生命果 will begin to grow in the 地下丛林 (Life Fruit will already grow in the 主机 and 移动 versions, but will now grow more after one mechanical boss is defeated).
- 撒旦军队 upgrades to Tier 2 and will progress to wave 7. (Betsy will not spawn however)
Defeating all three triggers the status message "The jungle grows restless...", and 世纪之花球茎s begin spawning in the 地下丛林, which are required to summon 世纪之花.
|| Spawn Message
|| Summoning Item
|| Soul Type
|| "You feel vibrations from deep below..." or "You feel a quaking from deep underground..."
|| "This is going to be a terrible night..."
|| "You feel the air getting colder around you..." or "The air is getting colder around you..."
|| 万矢齐发 • "打败三个夜间出没的危险机械怪物：双子魔眼、毁灭者和机械骷髅王。"
| Defeat all three Mechanical Bosses.
|| 机甲混战 • "同时与双子魔眼、毁灭者和机械骷髅王战斗并获胜。"
| Defeat all three Mechanical Bosses simultaneously in a single battle.
- In the 电脑版, bringing their summoning items to a pre-Hardmode world makes it possible to defeat the Mechanical Bosses prior to defeating the 血肉墙. However, the Wall must still be defeated in order to unlock 世纪之花.
- There is a tooltip mistake for the Mechanical Worm. The tooltip says "Summons Destroyer", but should actually say "Summons The Destroyer"
- Players who aren't confident in their ability to defeat the bosses, but who want access to the Hardmode 矿石, can refrain from destroying any 祭坛s until they are ready and instead 鱼 for 宝匣, 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.
- In the 移动版, the player can find a 斧钻 in a 暗影箱 in the 地狱, allowing the player to get to the 海龟盔甲 before defeating any of the Mechanical Bosses, making it much easier to defeat them on the first try.
- On the 移动版, some spoilers included The Destroyer having blue lit segments instead of red segments.
- See the individual mechanical boss articles for more specific changes.
- 18.104.22.168：生命果 now only spawns after defeating a Mechanical Boss.
- 1.2.4：Fixed bug where "The jungle grows restless" message would appear before you have beaten all 3 Mech Bosses.
- 22.214.171.124：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.
- 126.96.36.199：Mechanical Bosses will no longer spawn during 南瓜月s.
- 1.2.1：Reduced the chance for a mechanical boss summon to drop during hardmode.
- 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.