Price +2 bonus
A negating weapon briefly nullifies some forms of damage reduction when it damages a creature. Whenever a negating weapon damages a foe with DR/chaotic, DR/evil, DR/good, DR/lawful, or DR/magic, it reduces the value of that damage reduction by 5 points for 1 round.
For example, a +1 negating lance hitting a creature with DR 10/good and lawful reduces the creature’s DR to 5/good and lawful. If the creature has a component to its damage reduction other than the alignment types listed above, that component is unaffected. Thus, if the +1 negating lance above hits a demon with DR 10/good and cold iron, it would leave the demon with DR 10/cold iron and 5/good for 1 round. The effects of multiple negating weapons (or multiple hits from the same weapon) do not stack. This ability can only be placed on melee weapons.
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