From publisher blurb:
A mechamancer blends machinery and flesh in an unholy union more powerful than sinew or gears alone. Alien technology, clockwork, or arcane apparatus might form the basis for these enhancements, but they always leave the mechamancer disconnected with their humanity. At best, a mechamancer might retain some spark of their former selves, but most eventually lose touch with reality and see only the processes and routines that guide them.
Mechamancers undergo augmentation for any number of reasons. Some find their human forms too frail, others yearn for immortality, and some are forced down the path by uncaring artificers as part of insane experiments that blend the natural and mechanical.
The mechamancer is an alternative to the barbarian class, and many of the additional options available to a barbarian can be rethemed to fit a mechamancer, with your GM’s approval. Specifically, surge and rage, and primary function and primal path, are synonymous. The mechamancer’s major difference from a standard barbarian is in how they use armor, and mechamancers gain several penalties and ability changes to balance their increase to Armor Class.