Blood of Shadows (2016)

Publisher's blurb:

Whether from the subterranean wilds of the Darklands or otherworldly realms of absolute shadow, heroes rise from the darkest nights. Pathfinder Player Companion: Blood of Shadows explores the strange paths and subtle abilities of adventurers empowered by darkness. Discover the secrets of races infused with shadow, like fetchlings, wayangs, and others. New combat styles and techniques reveal the skills of subterranean weapons masters, while penumbral spells grant mastery over the darkness itself. A host of other new archetypes, feats, magic items, and more allow characters of all types to infuse themselves with the power of shadow. Don’t fear the dark, let Blood of Shadows make you its master.