Price +2 bonus
The longer the wielder of a stalking weapon studies a target, the more effective her strike. As a standard action, a character wielding a stalking weapon can command it to study a creature within 60 feet. The wielder must have line of effect and line of sight to that target. When the wielder attacks the studied creature, on a successful hit the stalking weapon deals +1d6 points of bonus damage per consecutive round spent studying a target, up to a number of bonus dice equal to the stalking weapon’s enhancement bonus. This bonus damage is precision damage and only applies to the first successful hit against that creature.
If the wielder attacks a creature other than the studied creature, commands the weapon to study a different creature, or ends her turn more than 60 feet from the studied creature, the weapon loses all bonus damage dice against the previously studied creature.
Pathfinder Roleplaying Game: Ultimate Equipment (OGL) © 2012, Paizo Publishing, LLC; Authors: Dennis Baker, Jesse Benner, Benjamin Bruck, Ross Byers, Brian J. Cortijo, Ryan Costello, Mike Ferguson, Matt Goetz, Jim Groves, Tracy Hurley, Matt James, Jonathan H. Keith, Michael Kenway, Hal MacLean, Jason Nelson, Tork Shaw, Owen KC Stephens, Russ Taylor, and numerous RPG Superstar contributors