The Initiate's Handbook

From publisher blurb: The Initiate’s Handbook introduces a brand new sphere, the Mana sphere, to the Spheres of Power system for Pathfinder 1st edition. Learn to manipulate pure magic on a brand new level, including forging manabonds between casters, turning a caster’s own spell points against them, and other methods of manipulating essence. Become a master of magic like never before with the Mana sphere!