If you have not defeated Skeletron Prime yet and are already in hardmode, all enemies (minus statue-spawned enemies and meteor heads) have a 1 in 2500 chance of dropping this item.
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- The Mechanical Skull's texture is based off of the 骷髅头灯笼 furniture item.
- Like the 机械蠕虫, it looks like a wind-up toy.
- The Mechanical Skull bears a slight resemblance to the old Skeleton sprite, before update 1.0.4.
- 1.2.1：Drop chance reduced from 1 in 1000 (0.1%) to 1 in 2500 (0.04%).