From publisher blurb:
The Blood and Portents Handbook is a collection of archetypes, class options, talents, and more for expanding the Blood sphere and giving other thematic options for characters ranging from crafters of magical toys, masters of winter magic, and more.
Introduced in this book is a new Blood sphere power in the form of Blood Arts, as well as other powers allowing for forming blades from your own blood, binding a target in chains forged from their own blood, and more.
This handbook is designed to be used as a companion book with the updated Spheres of Power system of magic materials found in Ultimate Spheres of Power, as well as materials from Spheres of Might, Champions of the Spheres, and other Drop Dead Studio supplement products.