You can channel negative energy into your weapon, which then inflicts wounds that are difficult to heal by magical means.
Prerequisites: Ability to channel negative energy.
Benefit: You may expend one rebuke attempt to charge your weapon with negative energy, allowing it to inflict deadly wounds that resist magical healing. Weapons so empowered remain charged for a number of rounds equal to your Charisma bonus and all wounds inflicted by the weapon during that time are immune to healing by conjuration (healing) spells.
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