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Source: Quintessential Elf 2

Description: You may infuse your woven light items with positive energy.

Prerequisites: Turn Undead, Any "Weave" Feat

You can create items that have a positive energy taint. Applying this taint costs the weaver one daily use of his turn undead ability.

This is an uncommon taint that can be added by a weaver when using any of the Weave Item Creation Feats.

Infusing a weave with positive energy creates a channel for the forces of fundamental good. Evil aligned creatures touching or bearing the object suffer from a negative level until they discard it. Good creatures gain a +1 sacred bonus to Fortitude saves. Weapons tainted with positive energy deal good damage for the purposes of Damage Reduction and have a +2 sacred bonus to damage when striking evil creatures. Ranged weapons do not confer this bonus to their ammunition.