Mechanical Skull

The Mechanical Skull is used to summon Skeletron Prime, a harder version of Skeletron. 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 monsters and meteor heads) have a 1 in 2500 chance of dropping this item.

Used in
Console and Mobile versions:

Achievement
Like a Boss is the achievement you earn for obtaining any boss-summoning item.

History
Crâne Mécanique 기계식 두개골