Your witch knife is as much an extension of your body as it is an extension of your power.
Prerequisite(s): Witch Knife.
Benefit: You can use your witch knife as an additional focus component for all your witch spells, not just your patron spells, adding 1 to their DC. This bonus stacks with the bonus to patron spells granted by Witch Knife, granting your patron spells a total +2 bonus to their DC.
Additionally, the hand holding the witch knife is still considered free for the purpose of casting spells and delivering touch attacks.
Pathfinder Roleplaying Game Mythic Adventures © 2013, Paizo Publishing, LLC; Authors: Jason Bulmahn, Stephen Radney-MacFarland, Sean K Reynolds, Dennis Baker, Jesse Benner, Ben Bruck, Jim Groves, Tim Hitchcock, Tracy Hurley, Jonathan Keith, Jason Nelson, Tom Phillips, Ryan Macklin, F. Wesley Schneider, Amber Scott, Tork Shaw, Russ Taylor, and Ray Vallese.