机械骷髅头用于召唤机械骷髅王, the hardmode version of 骷髅王. It can only be used during night time. Using another Mechanical Skull while Skeletron Prime is alive will not consume the skull, and a second Skeletron Prime will not be summoned. It can also be used in a world without hardmode activated.
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.
- 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%).
- 1.2：Now a 困难模式 drop. Recipe changed.