From publisher blurb:
A supplement for Pathfinder 1st edition, adding an array of options to the classic antipaladin. New fiendish bonds offer flexibility, while sinister pacts can offer both specific evil aims and the supernatural means to pursue them. Archetypes allow you to pursue evil with a nimble blade, smoking gun, malevolent phantom, bewitching stare or the raw power of the elements. Feats support both the classic antipaladin and the archetypes presented here, while several traits are offered to flesh out your evil past.
Continuing professional development is an essential part of any career in the service of metaphysical Evil. Whether you are a blackguard raised from the cradle in the service of dark gods, a paladin newly-fallen from laughable idealism to a true understanding of the universe, or simply considering your career options, this publication is for you.