Juggernaut

The heavy suit of mechanical metal armor a juggernaut wears is custom-built and highly complex and specialized to its wearer. Other creatures can't make use of the armor unless they have similar skill and customize it thoroughly.

Although relatively uncommon across much of Golarion, the frequently eccentric but undeniably brilliant minds who create elaborate devices of clockwork, gunpowder, and steam often loom much larger in the public eye than their numbers would suggest.